Furuno GD-1720C User Manual

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SAFETY INSTRUCTIONS

WARNING

ELECTRICAL SHOCK HAZARD

Do not open the equipment.

Only qualified personnel should work inside the equipment.

Do not disassemble or modify the equipment.

Fire, electrical shock or serious injury can result.

Immediately turn off the power at the switchboard if the equipment is emitting smoke or fire.

Continued use of the equipment can cause fire or electrical shock. Contact a FURUNO agent for service.

Keep heater away from equipment.

WARNING

Radio Frequency Radiation Hazard

The radar antenna emits electromagnetic radio frequency (RF) energy which can be harmful, particularly to your eyes. Never look directly into the antenna aperture from a close distance while the radar is in operation or expose yourself to the transmitting antenna at a close distance.

Distances at which RF radiation levels of 100 and 10 W/m table below.

Note: If the antenna unit is installed at a close distance in front of the wheel house, your administration may require halt of transmission within a certain sector of antenna revolution. This is possible - Ask your FURUNO representative or dealer to provide this feature.

exist are given in the

A heater can melt the equipment's power cord, which can cause fire or electrical shock.

Use the proper fuse.

Fuse rating is shown on the equipment. Use of a wrong fuse can result in damage to the equipment.

CAUTION

A warning label is attached to the equipment. Do not remove the label. If the label is missing or damaged, contact a FURUNO agent or dealer about replacement.

WARNING

To avoid electrical shock, do not remove cover. No user-serviceable parts inside.

Name: Warning Label (1) Type: 86-003-1011-0 Code No.: 100-236-230

MODEL

1724C

1734C

Distance to

100 W/m

Nil

0.40 m

point

Distance to

10 W/m

Worst case 1.50 m

Worst case 4.00 m

point

CAUTION

No one navigation device should ever be solely replied upon for the navigation of a vessel.

Always confirm position against all available aids to navigation, for safety of vessel and crew.

NOTICE

The brilliance of the LCD is adjustable to match a wide variety of lighting conditions. However, its maximum setting may not be sufficiently bright to permit viewing of the display with polarized sunglasses.

2.10 Measuring the Range ............................2-9

FOREWORD ...................................vii

SYSTEM CONFIGURATIONS .........ix

1. OPERATIONAL OVERVIEW.. 1-1

1.1 Operating Controls ..................................1-1

1.1.1 Display unit controls........................ 1-1

1.1.2 Remote controller............................ 1-3

1.2 Inserting a Chart Card.............................1-4

1.3 Turning the Unit On/Off ...........................1-5

1.4 Display Brilliance, Panel Brilliance, Hue .1-6

1.4.1 Display brilliance, panel brilliance.... 1-6

1.4.2 Hue ..................................... 1-7

1.5 Selecting a Display..................................1-8

1.5.1 Display modes ................................ 1-8

1.5.2 Selecting a display .......................... 1-9

1.5.3 Switching control in combination and

overlay screens ................................... 1-10

1.5.4 Selecting image source..................1-11

1.6 Cursor pad, Cursor................................1-12

1.7 Entering the MOB Mark, Setting MOB as

Destination...................................................1-13

1.8 Data Boxes ............................................1-14

1.8.1 Showing, hiding data boxes with soft

key ................................... 1-14

1.8.2 Rearranging data boxes................ 1-14

1.8.3 Temporarily erasing a data box ..... 1-14

1.9 Function Keys........................................1-15

1.10 Simulation Display...............................1-16

2. RADAR OPERATION ............. 2-1

2.1 Radar Display ..........................................2-1

2.2 Transmitting, Stand-by ............................2-2

2.3 Tuning......................................................2-2

2.4 Adjusting the Gain ...................................2-2

2.5 Reducing Sea Clutter ..............................2-3

2.5.1 How the A/C SEA works .................. 2-3

2.5.2 Adjusting the A/C SEA..................... 2-4

2.6 Reducing Precipitation Clutter.................2-4

2.7 Range Scale ............................................2-5

2.8 Pulselength..............................................2-6

2.9 Presentation Mode ..................................2-7

2.9.1 Selecting a presentation mode........ 2-7

2.9.2 Description of presentation modes.. 2-8

2.10.1 Measuring range by range rings.....2-9

2.10.2 Measuring range by cursor ............ 2-9

2.10.3 Measuring range by VRM ............2-10

2.10.4 Various VRM operations ..............2-10

2.11 Measuring the Bearing ........................ 2-11

2.11.1 Measuring bearing by cursor........ 2-11

2.11.2 Measuring bearing by EBL........... 2-11

2.11.3 Various EBL operations................ 2-11

2.12 Erasing the Heading Line, North Marker....

.................................................2-12

2.13 Reducing Noise Interference...............2-12

2.14 Rejecting Radar Interference ..............2-13

2.15 Zoom .................................................2-14

2.15.1 Zooming radar targets..................2-14

2.15.2 Zooming ARP, TTM targets ..........2-14

2.16 Shifting the Picture ..............................2-15

2.16.1 Manual shift .................................2-15

2.16.2 Automatic shift ............................. 2-15

2.17 Using the Offset EBL ...........................2-16

2.17.1 Predicting collision course............2-16

2.17.2 Measuring range & bearing between

two targets ..................................2-17

2.18 Echo Trails...........................................2-18

2.18.1 Trail time ..................................2-18

2.18.2 Starting echo trails .......................2-19

2.18.3 Trail gradation..............................2-20

2.18.4 Trail color ..................................2-20

2.19 Echo Stretch ........................................2-21

2.20 Echo Averaging ...................................2-22

2.21 Outputting TLL Data ............................2-23

2.22 Guard Alarm ........................................2-24

2.22.1 Setting a guard alarm zone..........2-24

2.22.2 When the alarm is violated… .......2-25

2.22.3 Cancelling the guard alarm..........2-25

2.23 Watchman............................................2-25

2.23.1 How watchman works.................. 2-25

2.23.2 Turning on/off watchman..............2-26

2.23.3 Setting watchman stand-by interval ....

..................................2-26

2.24 Waypoint Marker .................................2-27

2.25 ARP, TTM Operation ...........................2-28

2.25.1 Activating/deactivating ARP, TTM 2-29

2.25.2 Acquiring and tracking targets (ARP)

..................................................... 2-29

2.25.3 D6isplaying target number (ARP, TTM)

..................................................... 2-31

2.25.4 Terminating tracking of ARP targets

..................................................... 2-31

2.25.5 Setting vector attributes (ARP) ......... 2-32

2.25.6 Displaying past position (ARP) ......... 2-33

2.25.7 ARP, TTM target data....................... 2-34

2.25.8 CPA/TCPA alarm (ARP) ................... 2-35

2.25.9 Lost target alarm (ARP).................... 2-36

2.26 Interpreting the Radar Display ............. 2-37

2.26.1 False echoes ................................... 2-37

2.26.2 SART (Search and Rescue

Transponder) ...................................2-38

2.26.3 Racon (Radar Beacon)..................... 2-39

3. PLOTTER OPERATION.........3-1

3.1 Plotter Displays ..................................... 3-1

3.1.1 Full-screen plotter display................... 3-1

3.1.2 Nav graphic display............................ 3-3

3.1.3 Highway display.................................3-6

3.1.4 Nav data display.................................3-7

3.2 Presentation Mode................................ 3-8

3.3 Shifting the Display................................3-9

3.4 Chart Scale........................................... 3-9

3.5 Chart Cards...........................................3-9

3.5.1 Chart card overview ...........................3-9

3.5.2 Indices and chart enlarge-

ment ................................................ 3-10

3.5.3 Navionics charts............................... 3-11

3.5.4 C-MAP charts................................... 3-14

3.6 Working with Track.............................. 3-18

3.6.1 Displaying track................................ 3-18

3.6.2 Stopping, restarting plotting of

own ship track.................................. 3-19

3.6.3 Changing track color ........................ 3-19

3.6.4 Track plotting method and

interval for own ship track................. 3-20

3.6.5 Changing own ship track/mark

distribution setting............................ 3-21

3.6.6 Erasing track.................................... 3-22

3.7 Marks, Lines........................................3-24

3.7.1 Entering a mark, line........................ 3-24

3.7.2 Changing mark attributes ................. 3-24

3.7.3 Selecting line type............................ 3-25

3.7.4 Erasing marks, lines......................... 3-26

3.8 Waypoints ...........................................3-27

3.8.1 Entering waypoints........................... 3-27

3.8.2 Editing waypoint data ....................... 3-29

3.8.3 Erasing waypoints ............................ 3-30

3.8.4 Changing waypoint mark size

(Navionics GOLD)............................ 3-32

3.8.5 Searching waypoints ........................3-34

3.9 Routes ................................................ 3-35

3.9.1 Creating routes ................................ 3-35

3.9.2 Connecting routes ............................ 3-38

3.9.3 Inserting waypoints...........................3-39

3.9.4 Removing waypoints from a route.....3-40

3.9.5 Erasing routes..................................3-41

3.10 Navigation........................................... 3-41

3.10.1 Navigating to a “quick point” ............. 3-41

3.10.2 Navigating to waypoints....................3-42

3.10.3 Navigating to ports, por3 services..... 3-43

3.10.4 Following a route.............................. 3-45

3.10.5 Canceling route navigation...............3-48

3.11 Alarms.................................................3-49

3.11.1 Audio alarm on/off ............................ 3-49

3.11.2 Arrival alarm.....................................3-50

3.11.3 Anchor watch alarm..........................3-51

3.11.4 XTE (Cross-Track Error) alarm ......... 3-52

3.11.5 Speed alarm..................................... 3-52

3.11.6 Proximity alarm ................................ 3-53

3.11.7 Trip alarm.........................................3-53

3.11.8 Grounding alarm (C-MAP

specification).................................... 3-54

3.11.9 Alarm information.............................3-55

3.12 Resetting Trip Distance........................3-57

4. VIDEO SOUNDER OPERATION

................................................4-1

4.1 Sounder Displays .................................. 4-1

4.1.1 Selecting a sounder display................ 4-1

4.1.2 Description of sounder displays ..........4-2

4.1.3 Selecting screen split method in

combination displays.......................... 4-6

4.2 Automatic Sounder Operation................4-6

4.2.1 How the automatic sounder works ...... 4-6

4.2.2 Types of automatic sounder modes ....4-6

4.2.3 How to enable automatic sounder

operation............................................4-7

4.3 Manual Sounder Operation.................... 4-7

4.3.1 Selecting the manual mode ................4-7

4.3.2 Selecting display range ......................4-7

4.3.3 Adjusting the gain...............................4-8

iii

4.3.4 Shifting the range............................ 4-8

4.4 Measuring Depth, Time ...........................4-9

4.5 Reducing Interference.............................4-9

4.6 Reducing Low Level Noise....................4-10

4.7 Erasing Weak Echoes ...........................4-11

4.8 White Marker .........................................4-12

4.9 Picture Advance Speed .........................4-12

4.9.1 Advancement independent of ship’s

speed ................................... 4-12

4.9.2 Advancement synchronized with ship’s

speed ................................... 4-13

4.10 Display Colors .....................................4-14

4.11 Alarms .................................................4-15

4.11.1 Audio alarm on/off ....................... 4-15

4.11.2 Bottom alarm............................... 4-16

4.11.3 Fish alarm ................................. 4-16

4.11.4 Fish alarm (B/L)........................... 4-17

4.11.5 Water temperature alarm............. 4-17

4.11.6 When an alarm setting is violated........

................................... 4-18

4.12 Water Temperature Graph...................4-19

4.13 Changing Pulse Repetition Rate.........4-19

4.14 Saving Sounder Picture to an SD Card .....

.................................................4-20

4.15 Interpreting the Sounder Display ........4-20

4.15.1 Zero line ................................. 4-20

4.15.2 Bottom echo................................ 4-21

4.15.3 Fish school echoes ..................... 4-22

4.15.4 Surface noise/Aeration ................ 4-22

5. AIS OPERATION .................... 5-1

5.1 Turning AIS Feature On/Off................ 5-1

5.2 AIS Symbols ..................................... 5-3

5.3 Setting Number of AIS Targets to Display.

..................................... 5-3

5.4 Activating Targets............................... 5-4

5.5 Displaying Target Data ....................... 5-4

5.6 Lost Target ..................................... 5-5

5.7 Setting CPA and TCPA....................... 5-5

5.8 Proximity Alarm .................................. 5-6

5.9 Showing, Hiding AIS Target Tracks .... 5-7

5.10 Choosing Vector Time ...................... 5-7

5.11 Displaying Past Positions of AIS Targets

..................................... 5-8

6. DATA TRANSFER .................. 6-1

6.1 Memory Card Operations........................6-1

6.1.1 Deleting all data from memory cards

(other than chart data).............................. 6-1

6.1.2 Saving data to a memory card .........6-2

6.1.3 Playing back data from a memory card

......................................6-3

6.2 Uploading, Downloading Data.................6-4

6.2.1 Setting communication software on the

PC ......................................6-4

6.2.2 Uploading or downloading data........6-4

6.3 Loading Waypoint Data from Yeoman.....6-7

6.4 Receiving Data Via Network Equipment .6-8

6.5 Outputting Data Through the Network ....6-9

7. CUSTOMIZING YOUR UNIT... 7-1

7.1 General Setup.................................7-1

7.2 Radar Setup ............................................7-4

7.2.1 Radar display setup.........................7-4

7.2.2 Radar range setup...........................7-7

7.2.3 Function key setup...........................7-8

7.3 Plotter Setup ..........................................7-10

7.3.1 Navigation options .........................7-10

7.3.2 Function key setup.........................7-11

7.4 Chart Setup ...........................................7-14

7.4.1 Chart offset....................................7-14

7.4.2 Navionics GOLD chart attributes....7-15

7.4.3 C-MAP chart attributes...................7-16

7.5 Data Boxes Setup..................................7-22

7.6 Hot Page Setup .....................................7-23

7.7 Navigator Setup.....................................7-24

7.7.1 Navigation data source ..................7-24

7.7.2 GPS receiver setup (Set equipped with

GP-310B/320B) ....................................7-26

7.7.3 TD display setup............................7-29

7.8 Nav Data Display Setup ........................7-32

7.9 Sounder Setup.......................................7-33

7.9.1 System setup.................................7-33

7.9.2 Sensor setup .................................7-36

7.9.3 Sounding range, zoom range, bottom

lock range...............................................7-37

7.9.4 Function key setup.........................7-38

7.10 Nav Graphic Display Setup .................7-40

8. MAINTENANCE,

TROUBLESHOOTING .................. 8-1

8.1 Preventive Maintenance ..........................8-1

8.2 Replacement of Batteries........................8-2

8.3 Replacement of Fuse ..............................8-2

8.4 Replacing the Magnetron ........................8-3

8.5 Simple Troubleshooting...........................8-3

8.5.1 General ......................................8-3

8.5.2 Radar ......................................8-4

8.5.3 Plotter ......................................8-4

8.5.4 Sounder ...................................... 8-5

8.6 Diagnostics ..............................................8-6

8.6.1 Memory I/O test............................... 8-6

8.6.2 Test pattern......................................8-8

8.6.3 Keyboard, remote controller test.... 8-10

8.7 GPS Status Display ............................... 8-11

8.8 Clearing Memories ................................8-12

8.9 Error Messages .....................................8-13

APPENDIX ................................. AP-1

Menu Overview ................................... AP-1

ALARM key AP-9

Geodetic Chart List...................................AP-10

Icons ......................................................... AP-11

SPECIFICATIONS........................SP1

INDEX...........................................IN-1

Declaration of Conformity

COMPLIANCE WITH R&TTE DIRECTIVE 1999/5/EC

This radar complies with the R&TTE Directive 1999/5/EC. In accordance with Article 6-3 of this directive, FURUNO intends to put this radar on the market of the following countries in EU as well other markets.

Austria, Belgium, Cyprus, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Malta, Poland, Portugal, Slovenia, Spain, Sweden, The Netherlands, United Kingdom, Iceland, Norway

FOREWORD

A Word to the Owner of the Model 1724C/1734C Series Marine Radar, GD-1720C Color Video Plotter

FURUNO Electric Company thanks you for purchasing the Model 1724C/1734C Series Marine Radar, GD-1720C Color Video Plotter. We are confident you will discover why the FURUNO name has become synonymous with quality and reliability.

For over 50 years FURUNO Electric Company has enjoyed an enviable reputation for quality and reliability throughout the world. This dedication to excellence is furthered by our extensive global network of agents and dealers.

Your equipment is designed and constructed to meet the rigorous demands of the marine environment. However, no machine can perform its intended function unless properly installed and maintained. Please carefully read and follow the operation and maintenance procedures set forth in this manual.

We would appreciate feedback from you, the end-user, about whether we are achieving our purposes.

Thank you for considering and purchasing FURUNO.

Features

The 1724C/1734C Radar Series and the GD-1720C Video Plotter work within our network system called the “NavNet.” Each product has an IP address to communicate with NavNet compatible products within the network, using TCP/IP protocol through an Ethernet 10BASE-T network.

The main features are as follows:

• Bright 7” screen visible even under direct sunlight.

• User friendly operation with combination of discrete keys, soft keys, and cursor pad.

• Accepts the following SD chart cards: NAVIONICS GOLD or C-MAP NT+/NT MAX charts,

depending on specification. All names mentioned above are registered trademarks of their respective companies.

• Fast chart redraw.

• Built-in NavNet interface circuit board.

• 12-channel GPS Receiver GP-310B with highly accurate position fixing optionally

available, GP-310B and 320B (WAAS capability).

• User programmable function keys.

• Video sounder picture available with connection of the optional Network Sounder.

• ARP function (when connecting with MODEL 1824C series)

vii

Notice

•

No part of this manual may be copied or reproduced without written permission.

•

If this manual is lost or worn, contact your dealer about replacement.

•

The contents of this manual and equipment specifications are subject to change without notice.

•

The example screens (or illustrations) shown in this manual may not match the screens you see on your display. The screen you see depends on your system configuration and equipment settings.

•

This manual is intended for use by native speakers of English.

•

FURUNO will assume no responsibility for the damage caused by improper use or modification of the equipment or claims of loss of profit by a third party.

viii

SYSTEM CONFIGURATIONS

All NavNet products incorporate a “network circuit board” to integrate each NavNet product on board through an optional LAN cable (Ethernet 10BASE-T). Each NavNet product is assigned an IP address to enable transfer of images between other NavNet products. For example, video plotter pictures can be transferred to a radar and vice versa. Pictures received via the NavNet may be adjusted at the receiving end.

The number of display units which may be installed depends on the number of network sounder connected. For a system incorporating three or more products, a “hub” is required to process data.

For one network sounder: one radar and three plotters, or four plotters For two network sounder: one radar and two plotters, or four plotters

NavNet system (Model 1724C/1734C)

AIS transponder

Other NavNet unit

(GD-1720C, etc.)

AIS Interface IF-1500AIS*

* Not required for AIS Transponder FA-150.

Remote Controller RMC-100

Network sounder

ETR-6/10N

Antenna Unit

(ex. MODEL 1724C)

Display Unit

RDP-148

ETR-30N

12-24 VDC

GPS receiver

GP-310B/320B

Echo sounder

Navigator

External buzzer

Echo sounder

Heading

sensor

HUB

AIS RECEIVER

Rectifier

PR-62

FA-30

100/110/115/220/230 VAC

1φ, 50/60 Hz

NavNet system (Model 1724C/1734C)

Single-unit NavNet system (GD-1720C)

GP-310B/320B

AIS transponder

AIS Interface IF-1500AIS*

* Not required for AIS Transponder FA-150.

GPS receiver

External buzzer

Display Unit

RDP-148

Echo sounder

Heading sensor

Other NavNet unit

(MODEL 1724C etc.)

Remote

HUB

Controller RMC-100

FA-30

AIS RECEIVER

Network sounder

ETR-6/10N

Single-unit NavNet system (GD-1720C)

12-24 VDC

Rectifier

PR-62

100/110/115/220/230 VAC

1φ, 50/60 Hz

Two-unit NavNet system

Antenna Unit

Radar data

GP-310B/320B

Plotter data

Two-unit NavNet system

Three-or-more-unit NavNet system (Max. 4 display units)

Antenna Unit

Radar data

GP-310B/320B

Plotter data

HUB

Sounder data

Note: The picture disappears 10 seconds after the NavNet

Network sounder

ETR-6/10N

Three-or-more-unit NavNet system

cable is disconnected from a "sub" NavNet display unit.

xii

1. OPERATIONAL OVERVIEW

This chapter provides the basic information needed to get you started using your radar, video plotter.

1.1 Operating Controls

1.1.1 Display unit controls

Display unit controls

The radar, video plotter, sounder and chart systems are operated with the controls of the display unit (and the remote controller). Ten keys are labeled and they provide the function shown on their labels. The five soft keys provide various functions according to current operating mode. The ENTER knob mainly functions to register selections on the menu and adjust the EBL, VRM and gain. The Cursor pad’s main function is to move the cursor across the screen. When you correctly execute an operation, the unit generates a beep. Invalid operation causes the unit to emit three beeps.

Selects display mode.

Momentary press:

Registers own ship’s position as a waypoint.

Press three seconds:

Marks man overboard position.

Soft keys

Shows or hides the soft keys, function keys, nav data alternately.

Cursor pad Selects menu items and options; shifts cursor. Press, release and press again to change setting consecutively.

Opens/closes the alarm menu. Clears data; erases selected mark.

Opens/closes the main menu.

Selects a range. ENTER knob

Push: Registers options on menus. Rotate: Selects character; adjusts sensitivity

(sounder, radar); chooses menu items and options. Displays the soft keys for EBL/VRM. Radar: Displays the soft keys for adjustment of gain, A/C SEA, A/C RAIN and FTC.

Sounder: Adjusts gain.

Long press: Turns power on/off. Momentary press: Opens the

display for adjustment of brilliance, etc. For radar, switches STBY and TX.

Chart slot

1-1

1. OPERATIONAL OVERVIEW

Soft keys

The function of the five soft keys changes according to the operation. Their labels for their current functions are shown on the screen to the left of the keys. To hide or show the soft keys, press the HIDE/SHOW key. Each press of the key shows preset soft keys, user function keys or turns off navigation information (at the top of the screen).

SOFT KEYS

Display unit

Some soft keys show the current setting of a soft key in reverse video as shown below.

34° 22. 3456'N 359.9°M TRIP NU 080° 22. 3456'E

16.0nm

19.9 kt 99.9 nm

MARK

ENTRY

MODE

NTH UP

NAV

POS

Current option shown in reverse video

D.BOX

WPT 002

FISH

BRIDGE

ON/OFF

Plotter displays

1-2

1.1.2 Remote controller

ABC

RANGE

DEF

DISP

Operating distance 90°: Up to 5 m ±45°: Up to 3 m

SAVE

Replace the batteries (AA) when the

MOB

distance from which the display unit can be operated shortens.

GHI

1. OPERATIONAL OVERVIEW

JKL

MNO

Note: The remote controller may

PQR

become damaged if dropped. Mishandling of the remote

STU

VWX

YZ&

controller is not covered by the warranty.

TX /STBY

ALARM

SK4 SK5

GAIN

CENTER

CNTL

ACQ

HIDE /SHOW

EBL / VRM

MARK ENT

BRILL

WPT

’#

ENT

CLEAR

TONE

SK3SK1 SK2

Remote controller

Key Function Key Function

RANGE Same as RANGE key on

display unit.

DISP Same as DISP key on

display unit.

SAVE MOB Same as SAVE/MOB key on

display unit. Ten keys Enter alphanumerics. BRILL Adjusts display brilliance. EBL/VRM Same as EBL/VRM key on

display unit. GAIN Same as GAIN key on

display unit. WPT Displays “alphabet” WPT list

on plotter display.

MARK ENT Same as MARK ENTRY soft

key. CENTER Returns own ship to screen

center on plotter display. CNTL Switches control between

displays on combination

displays.

ENT Same as ENTER knob on

display unit.

CLEAR Same as CLEAR key on

display unit.

MENU Same as MENU key on

display unit.

TONE Not used.

TX/STBY Toggles radar between

standby and transmit.

ACQ Acquires radar target.

(Requires radar source equipped with ARP.)

ALARM Same as ALARM key on the

display unit.

HIDE/SHOW Same as HIDE/SHOW key

on display unit. SK1 – SK5 (soft keys)

Same as soft keys on display

unit.

1-3

1. OPERATIONAL OVERVIEW

1.2 Inserting a Chart Card

Your unit reads SD cards, in the following formats: Navionics GOLD Chart cards or C-MAP NT+/NT MAX chart cards, depending on the type of display unit you have. Insert the appropriate chart card for your area as follows:

1. Open the chart drive.

Chart slot

Display unit

2. Insert chart card label side up.

3. Close the lid.

To remove chart card, follow the steps shown below.

1. Press the MENU key to show the menu.

2. Press the SHOW/HIDE soft key.

3. Open the chart drive lid, and then push the card once and then pull it out.

Note 1: Do not remove a card while the chart is being drawn. This may cause the equipment to freeze.

Note 2: Do not insert or remove a card while the power is on. This may cause the equipment to freeze.

Note 3: For multiple display units, do not use the same chart card type in more than one display unit.

Note 4: Remove the card with care; rough handling can damage the card and destroy its contents.

1-4

1. OPERATIONAL OVERVIEW

1.3 Turning the Unit On/Off

Press the POWER/BRILL key to turn the unit on. A beep sounds and then the equipment shows the startup NavNet screen (about 20 seconds), the product information screen, startup test results and chart usage disclaimer. During this period the equipment is inoperative. The startup test checks the ROM, RAM, internal battery and backup data for proper operation, displaying the results for each as OK or NG (No Good). If NG appears an appropriate message appears on the screen. For any NG, try to press any key to go to the chart disclaimer screen, then perform the diagnostic test as shown in the paragraph “8.6 Diagnostics.”

For start up with the radar display, the magnetron takes from 60 seconds to 90seconds (depending on radar model) to warm up before the radar can be operated. The time remaining for warming up of the magnetron is counted down at the center of the display.

You may press any key at the chart disclaimer screen to show the last-used display, or wait several seconds to let the equipment do it for you.

To turn the unit off, press and hold down the POWER/BRILL key until the screen goes dark (approx. 3 sec.). To protect the LCD attach the hard cover. Note that the network sounder will be turned off approx. three minutes after turning off the power. This is due to the system’s electrical characteristics.

Note: The first time you turn on the power (or any time the power is applied after a memory reset), you are asked if you want to start the simulation mode, which provides simulated operation of the equipment after the installation mode selection. Push the ENTER knob to start the simulation mode, or press the CLEAR key to start normal operation. For further details about the simulation mode, see the paragraph “1.10 Simulation Display.”

1-5

1. OPERATIONAL OVERVIEW

1.4 Display Brilliance, Panel Brilliance, Hue

You can adjust display brilliance, panel brilliance and hue as shown below.

1.4.1 Display brilliance, panel brilliance

1. Press the POWER/BRILL key momentarily. A set of soft keys for adjustment of

brilliance and hue appear.

Current selection is higtlighted.

.125nm SP

.250/ 319.9

H-UP

DISPLAY BRILLIANCE

BRILL CONTST

DISPLY BRILL

PANEL BRILL

HUE

RADAR

STBY

RETURN

Brilliance adjustment soft keys

2. Press the DISPLY BRILL or PANEL BRILL soft key as appropriate. An adjustment window appears at the bottom of the screen. This window shows the name of the item selected for adjustment plus current brilliance level, by bar graph.

DISPLAY BRILLIANCE

Display brilliance Panel brilliance

PANEL BRILLIANCE

Display brilliance and panel brilliance windows

3. Adjust the ENTER knob, clockwise to raise the setting or counterclockwise to decrease it. You may also use the soft key pressed at step 2. Eight levels of display brilliance and panel brilliance are available.

4. Hit the RETURN soft key to finish.

Note 1: If the unit is turned off with minimum brilliance, the screen will be dark at the next power-up. Press the POWER/BRILL key consecutively to adjust the brilliance.

Note 2: This equipment does not have a contrast control.

1-6

1. OPERATIONAL OVERVIEW

1.4.2 Hue

You may select the colors for the radar, plotter and overlay displays as below.

1. Press the POWER/BRILL key momentarily.

2. Press the HUE soft key to show the hue setting window.

HUE

▲

DAY

NIGHT

TWILIGHT

MANUAL SET

▼

Hue window

3. Operate the Cursor pad to select hue desired, referring to the table below. MANUAL

SET follows the color settings on the CHART DETAILS menu for the plotter and the RADAR DISPLAY SETUP menu for the radar.

Night Day Twilight

Characters Red Black Green

Radar ring Red Green Green

Radar echo Orange Multi Orange

Background Black White Blue**

Landmass (plotter) Orange* Light-orange Orange

* = Beige and light-beige on C-MAP display unit.

**= Black for Overlay screen

4. Hit the RETURN soft key to finish.

Note: When using the overlay screen, the own ship track will be hidden if the radar background and own ship track are blue and the “MANUAL SET” hue setting is used. In this case, set HUE to other position and then return to “MANUAL” to show the own ship track in black.

1-7

1. OPERATIONAL OVERVIEW

1.5 Selecting a Display

1.5.1 Display modes

If you have a radar, navigator and network sounder five full-screen displays are available: radar, plotter, echo sounder, nav data and overlay. In addition to the full-screen display, you can divide the screen into halves and thirds to show two and three sets of images on a combination display.

Full screen

(Ex. radar)

Combination screen

(Ex. radar + sounder)

Overlay screen

(Radar and plotter,

color model only.

Requires L/L data)

Display screens

The table below shows the displays available with each screen type.

Screen type and available display screen

Full screen Combination screen options

(half- or thirds-screen)

Plotter, radar, sounder, nav data, overlay

Plotter, radar, sounder, compass (or wind), highway, compass (or wind)/highway, nav data, overlay

Overlay screen options

Radar + plotter

1-8

1. OPERATIONAL OVERVIEW

1.5.2 Selecting a display

1. Press the DISP key to show the display screen selection window. The icons of modes

not available are shaded. HOTPAGE 1-HOTPAGE 5 are user-arrangeable displays called “hot pages,” which you can configure as you like. For further details, see the paragraph “7.6 Hot Page Setup.”

Basic display

RADAR PLOTTER SOUNDER NAV DATA OVRLAY

HOTPAGE1 HOTPAGE2 HOTPAGE3HOTPAGE4 HOTPAGE5

screens

Hot pages

· TURN KNOB TO SELECT MODE AND PUSH KNOB TO ENTER.

· PUSH ANY SOFT KEY TO SELECT IMAGE SOURCE.

Display screen selection window

2. Rotate the ENTER knob to select a basic display screen or a hot page screen.

3. Push the ENTER knob.

4. If you select a basic display screen, a group of appropriate combination displays appear. In the example below, the radar combination screens are shown.

PUSH ENTER KNOB.

Radar combination screen selection window

5. Rotate the ENTER knob to select display desired.

6. Push the ENTER knob to finish.

1-9

1. OPERATIONAL OVERVIEW

1.5.3 Switching control in combination and overlay screens

A soft key is provided in relevant combination and overlay screens to switch control between displays. In the example below, the CNTRL PLOTTR and CNTRL RADAR soft keys enable switching control between the plotter and sounder screens in the plotter/sounder combination display.

3nm

H-UP

ST-BY

34° 22. 3456'N 359.9°M 080° 22. 3456'E

16.0nm

SIGNAL PROC.

RADAR DISPLY

NAV

359.9

19.9 kt 99.9 nm

FUNC

11.7nm

TRIP

TARGET

CNTRL

RADAR

CNTL

CNTRL

RADAR

To adjust plotter

CNTRL

PLOTTR

To adjust

3nm

H-UP

ST-BY

34° 22. 3456'N 359.9°M 080° 22. 3456'E

16.0nm

MARK ENTRY

MODE

NTH UP

NAV

359.9

POS

11.7nm

19.9 kt 99.9 nm

TRIP

CNTRL

PLOTTR

radar

WP-002

FISH

WP-002

FISH

Radar display selected Plotter display selected

How to swi t c h c ontrol between modes in the plo tter/sounder combinati on display

1-10

1. OPERATIONAL OVERVIEW

1.5.4 Selecting image source

When more than one network radar or network sounder is connected to the equipment, you may select an image source for each as shown below. This is not necessary when only one network radar or network sounder is connected.

1. Press the DISP key.

2. Press any soft key to show the following display.

▲

RADAR SOURCE 1 (HOST NAME: NAVNET1) SOUNDER SOURCE* SOUNDER _

IP ADDRESS

172.031.003.003

DEVICE NUMBER 2 (HOST NAME: NAVNET2)

IF THERE IS MORE THAN ONE NETWORK RADAR OR ECHO SOUNDER, YOU MAY SELECT THE IMAGE SOURCES FOR DISPLAY.

*: Do not change this setting.

SELECT SOURCE

EDIT

RETURN

Select source menu

3. Use the Cursor pad to select RADAR SOURCE, SOUNDER SOURCE or AUX SOURCE as appropriate, then press the EDIT key.

RADAR SOURCE

▲

1 (NAVNET1)

2 (NAVNET2)

3 (NAVNET3)

4 (NAVNET4)

▼

Radar source

Radar source and sounder source windows

4. Use the Cursor pad to choose source.

5. Push the ENTER knob to set.

6. Press the DISP key to finish.

7. Turn the power off and on again.

SOUNDER SOURCE

▲

ETR0 (SOUNDER)

¡

ETR1 (SOUNDER1)

ETR2 (SOUNDER2)

ETR3 (SOUNDER3)

ETR4 (SOUNDER4)

ETR5 (SOUNDER5)

ETR6 (SOUNDER6)

ETR7 (SOUNDER7)

ETR8 (SOUNDER8)

ETR9 (SOUNDER9)

▼

Sounder source

1-11

1. OPERATIONAL OVERVIEW

1.6 Cursor pad, Cursor

The Cursor pad functions to shift the cursor, for measurement of range and bearing to a location (radar) and latitude and longitude position (plotter). Roll the Cursor pad to shift the cursor. The cursor moves in the direction of Cursor pad rotation.

Cursor

.125nm SP

.250/ 319.9

H-UP

SIGNAL PROC

RADAR DISPLY

NAV FUNC

TARGET

ZOOM & D. BOX

359.9°R

0.24nm

Radar display

Cursor, cursor data

Cursor data L/L position, Range and bearing from own ship to cursor

Cursor

34° 22. 3456'N 272.4°M

080° 22. 3456'E

16.0nm

Plotter display

TRIP

15.9 nm 99.9 nm

MARK

ENTRY

MODE

NTH UP

CENTER

GOTO CURSOR

D. BOX ON/ OFF

1-12

1. OPERATIONAL OVERVIEW

1.7 Entering the MOB Mark, Setting MOB as

Destination

The MOB mark functions to mark man overboard position. You can inscribe the mark from any mode except nav data, when playing back data or conducting any test. Note that this function requires position data.

Range, bearing

Note: The function of the SAVE/MOB key depends on the setting of SAVE

Man overboard

Current

position

MOB KEY FUNCTION in the GENERAL SETUP menu. The description below shows the procedure using the default setting. For further details, see Save

MOB concept

MOB Key Function on page 7-2.

1. Press and hold down the SAVE/MOB key for about three seconds when someone falls overboard. The display shows the waypoint number being saved (youngest empty waypoint number, 001-999) followed by the MOB confirmation window. Time remaining is counted down while pressing the SAVE/MOB key.

MOB mark

MOB Data Box Bearing and range to MOB position

(MOB)

162.5°

0.49 nm

WAYPOINT SAVED!

XXXWPT CONTINUE PUSHING FOR MOB!

XXX = Waypoint number

CONTINUE PUSHING FOR MOB!

XX SEC

XX = Time remaining is counted down.

MAN OVER BOARD! GO TO MOB? YES ... PUSH ENTER KNOB NO ... PUSH CLEAR KEY

MOB mark messages

2. Push the ENTER knob to select the MOB position as the destination, or press the CLEAR key to only mark current ship’s position as a waypoint. If you select the MOB

position as destination;

• A full-screen radar, plotter or overlay appears depending on the display in use. (If the

MOB key function is “MOB Without Confirmation” the range is automatically set to

0.5 nm.) Further, the waypoint marker appears on the radar display.

• The MOB mark “MOB” appears at the MOB position and a light-blue line runs

between it and current position. This line shows the shortest course to the MOB position.

• Range and bearing to the MOB position are shown in the MOB data box.

To erase an MOB mark from the plotter display, you must first erase its corresponding waypoint. Place the cursor on the MOB mark, then press the CLEAR key followed by pushing the ENTER knob to erase the waypoint. Then, repeat to erase the MOB mark.

1-13

1. OPERATIONAL OVERVIEW

1.8 Data Boxes

Data boxes, providing navigation data, may be shown on any full-screen display. Up to six data boxes (two in case of large characters) may be shown, and the default data boxes are position (in latitude and longitude), course over ground, speed over ground and trip log. The user may choose which data to display, where to locate it, and show or hide it as desired. In addition, data boxes may be set independently for each display mode (plotter, radar, sounder). For how to select data for the data boxes, see the paragraph “7.5 Data Boxes Setup.”

.125nm SP

.250/ 319.9

H-UP

MARK

ENTRY

MODE

NTH UP

NAV

POS

TRIP LOG

177nm

POSITION 47

58.535'N

122

36.496'W

COG

323.6

SOG

D.BOX

ON /OFF

20.0

350.4

0.000 nm

Data boxes

1.8.1 Showing, hiding data boxes with soft key

Plotter: D. BOX ON/OFF Radar: ZOOM & D. BOX

→

D. BOX ON/OFF (EBL/VRM data box, cursor data

box also shown/hidden) Sounder: AUTO/D. BOX

→

D. BOX ON/OFF

1.8.2 Rearranging data boxes

You may select the location for data boxes as follows:

1. Using the Cursor pad, place the cursor inside the data box you wish to move. As the cursor enters the box it changes to a “hand”. Push the ENTER knob, and the hand changes to a fist, meaning the box is correctly selected.

2. Use the Cursor pad to move the data box to the location desired, then push the ENTER knob.

1.8.3 Temporarily erasing a data box

If a data box is obscuring a desired object, you may temporarily erase the box. Use the

Cursor pad to place the cursor inside the data box you wish to erase, then press the CLEAR key. To redisplay the box, press the D. BOX soft key twice to display it.

1-14

1. OPERATIONAL OVERVIEW

1.9 Function Keys

The function keys provide for one-touch execution of a desired function. The default function key settings are as shown in the table below.

Function

Key

Radar Plotter Sounder

Default Setting, Key Label

#1 Heading line on/off, HL Track on/off, TRK TLL output, TLL

#2 Rings on/off, RNG Edit mark/line, EML Clutter, CLT

#3 Echo trail, TRL Ruler, RUL Signal level, SLV

#4 Offcenter, OFC

Add new waypoint,

Noise limiter, NL

ADD

#5 STBY/TX, TX

Waypoint

Picture advance, PA

alphanumeric list, ALP

1. Press the HIDE/SHOW key to replace the preset soft key labels with the function key

labels.

.125nm SP

.250/ 319.9

°M

TARGET

H-UP

H L

R N G

S F T

B X

Function keys

34° 22. 3456'N 359.9°M

080° 22. 3456'E

16.0nm

002WP

FISH

BRIDGE

19.9 kt 99.9 nm

TRIP

T R K

R U

A D D

A L p

Function keys

359.9°R

0.24nm

Radar

Plotter

Function k eys

2. Press function key desired.

Note: Function keys can be individually programmed for the plotter, radar and sounder displays. For further details see the following:

Radar: paragraph 7.2.3 Plotter: paragraph 7.3.2 Sounder: paragraph 7.9.4

1-15

1. OPERATIONAL OVERVIEW

1.10 Simulation Display

The simulation display, for use by service technicians for demonstration purposes, provides simulated operation to help acquaint you with the many features your unit has to offer. It allows you to view and control a simulated plotter, radar and sounder picture, without position-fixing equipment, network radar or a network sounder. Most controls are operative, thus you may practice setting destination, enter waypoints, measure range and bearing to a target, etc. Three simulation displays are provided for both the radar and echo sounder.

The simulation icon (SIM) appears when any simulation mode is active.

To start the simulation display;

1. Press the MENU key.

2. Press the SYSTEM CONFIGURATION, SYSTEM SETUP and SIMULATION SETUP soft keys in that order.

SIM

RADAR

LIVE

PLOTTER

LIVE

SOUNDER

LIVE

SPEED

00.0kt

COURSE

000.0°

LATITUDE

45°35.000’N

LONGITUDE

123°00.000’W

START DATE & TIME

00:00 01.APR.01

GET RADAR SIMULATION DATA

SETUP

EDIT

RETURN

Simulation setup menu

3. Follow appropriate procedure on the next several pages. To stop the simulation mode and return to normal operation, choose LIVE for radar, sounder or plotter.

Radar

NavNet display unit-generated ech oes or user data

1. Select RADAR, then press the EDIT soft key.

RADAR

▲

BUILT IN DATA 1

BUILT IN DATA 2

USER DATA

LIVE

▼

2. Select BUILT IN DATA 1 or 2 for internally generated echoes or USER DATA for user-saved radar data. Push the ENTER knob.

3. Press the MENU key to close the menu.

1-16

1. OPERATIONAL OVERVIEW

NavNet radar antenna-generated echoes (not available with the GD-1720C)

1. Select GET RADAR SIMULATION DATA, then press the EDIT soft key.

2. Select YES, then push the ENTER knob to erase simulation data and get new data. The message “NOW GETTING SIMULATION DATA. Do not turn off display unit.” appears while the unit is receiving radar data.

Note: If the network radar could not be found “Radar source is not found. Cannot get demo data.” appears. And if the radar is not active, the message “Radar is not active. Cannot get demo data.” is displayed. Check that the radar is plugged in and its signal cable is firmly fastened.

3. Select RADAR, then press the EDIT soft key.

4. Select BUILT IN DATA 2, then push the ENTER knob.

5. Press the MENU key to close the menu.

Plotter

1. Select PLOTTER, then press the EDIT soft key.

2. Select SIMULATION, then push the ENTER knob.

3. Select SPEED, then press the EDIT soft key.

4. Enter speed (setting range, 0-99 kt, default speed, 0 kt) with the alphanumeric keys, then push the ENTER knob.

PLOTTER

▲

{

SIMULATION

LIVE

▼

5. Select COURSE, then press the EDIT soft key.

6. Select “8 FIGURE” to trace the simulated ship’s track in a figure-eight course, or enter your own course at DIRECTION. To enter course, use the Cursor pad to select digit, and enter value with the alphanumeric keys.

7. Press the ENTER soft key.

8. Select LATITUDE, then press the EDIT soft key.

9. Enter latitude (setting range, 85

N-85°S, default setting, 45°35.000’N), then push the

ENTER knob.

10. Select LONGITUDE, then press the EDIT soft key.

11. Enter longitude (setting range, 180

E-180°W, default setting, 125°00.000’W), then push

the ENTER knob.

12. Select START DATE & TIME, then press the EDIT soft key.

13. Enter start date and time, then push the ENTER knob.

14. Press the MENU key to close the menu.

Sounder

1. Select SOUNDER, then press the EDIT soft key.

2. Select BUILT IN DATA (internally generated echoes) or ETR (network sounder-generated echoes), then push the

ENTER knob.

Note: The depth, shift, bottom-zoom, bottom-lock and

bottom discrimination cannot be shown in the BUILT IN DATA mode.

3. Press the MENU key to close the menu.

SOUNDER

▲

{

BUILT IN DATA

{

ETR

LIVE

▼

1-17

1. OPERATIONAL OVERVIEW

This page intentionally left blank.

1-18

2. RADAR OPERATION

This chapter covers radar operation, including the ARP (Auto Plotter) function. ARP requires a Model 18x4C/19x4C series network radar equipped with the ARP circuit board as radar source.

2.1 Radar Display

Range/ range ring interval

Presentation mode

Alarm icon

Battery icon

Zoom area

Guard zone 1

Cursor

Pulselength

.125nm

.250

. / 319.9

Heading M: Magnetic T: True

°M

H-UP

Heading line

North marker

TRAIL 30m

02m30s

G1 IN

G2 OUT

ES L

IR L

Trail time Trail elapsed time

Guard zone 1 Guard zone 2 Echo stretch

Interference rejector Guard zone 2

VRM2

EBL1 VRM1 EBL2

Range ring

Own ship vector* (ARP-equipped model, true vector mode)

Zoom window

EBL1 range

VRM1 range

EBL1

27.0°R VRM1 0 .158nm

EBL2

327.1°R VRM2 0 .225nm

EBL2 bearing, VRM2 range

359.9°R

0.18nm

* = Radar source Model 1834/1834C series radar

Cursor range and bearing (Cursor position may also be shown, in L/L or Loran C TD.)

Radar display

2-1

2. RADAR OPERATION

2.2 Transmitting, Stand-by

1. Confirm that the network radar is plugged in.

2. Press the DISP key to select a radar display.

3. Press the POWER/BRILL key momentarily.

4. Press the RADAR STBY soft key to highlight TX on its label.

5. Press the RETURN soft key.

When the radar picture is not required, but you want keep it in a state of readiness, press the RADAR TX soft key to highlight STBY on its label.

2.3 Tuning

The radar receiver can be tuned automatically or manually, and the default tuning method is automatic. If you require manual tuning, do the following:

1. Press the MENU key to display the main menu.

2. Press the RADAR DISPLAY SETUP soft key.

3. Select TUNING, then press the EDIT soft key.

TUNING

AUTO

MAN

Tuning window

4. Choose MAN.

5. Adjust the ENTER knob until the tuning bar is at its longest position.

6. Press the MENU key to close the menu.

Note: If the auto setting does not provide satisfactory tuning, ask your dealer how to re-adjust tuning.

Tuning bar

2.4 Adjusting the Gain

The GAIN key adjusts the gain sensitivity of the radar receiver. It works in a manner similar to that of volume control of a broadcast receiver, which amplifies received signals.

The proper setting is such that the background noise is just visible on the screen. If your gain setting is too low, weak echoes may be missed. On the other hand, excessive gain yields too much background noise; strong targets may be missed because of the poor contrast between desired echoes and the background noise on the display.

To adjust the receiver sensitivity, transmit on long range, and then do the following:

2-2

1. Press the GAIN key to show the “gain adjustment” soft keys, and the last-used adjustment window appears. The example below shows the gain sensitivity adjustment window. The gain soft keys shown depend on radar source as shown below.

2. If the gain sensitivity window is not displayed, press

GAIN SENSITIVITY

AUTO ROUGH

AUTO MODERATE

AUTO CALM

MAN

the GAIN soft key to show the gain sensitivity setting window.

Gain sensitivity window

3. Use the Cursor pad to select AUTO ROUGH, AUTO MODERATE, AUTO CALM, or MAN (manual) as appropriate. Select an AUTO option according to the sea state.

4. For manual adjustment, rotate the ENTER knob to adjust, while observing the radar echo. The range of adjustment is 0-100.

5. Press the GAIN key on the front panel or the RETURN soft key to finish.

Adjusting the FTC

To suppress rain clutter from heavy storms or scattered rain clutter, adjust the FTC. In addition to reducing clutter, the FTC can be used in fine weather to clarify the picture when navigating in confined waters. However, with the circuit active the receiver is less sensitive.

1. Press the GAIN key.

2. Press the FTC soft key, and then rotate the ENTER knob toadjust.

3. Press the GAIN key on the front panel or RETURN soft key to finish.

2.5 Reducing Sea Clutter

2.5.1 How the A/C SEA works

Echoes from waves can be troublesome, covering the central part of the display with random signals known as “sea clutter”. The higher the waves and the higher the antenna above the water, the further the clutter will extend. Sea clutter may affect radar performance because real targets are sometimes hidden by the echoes of small waves. (See the left-hand figure in the figure below.) When sea clutter masks the picture, adjust the A/C SEA to reduce the clutter.

The A/C SEA reduces the amplification of echoes at short ranges (where clutter is the greatest) and progressively increases amplification as the range increases, so amplification will be normal at those ranges where there is no sea clutter.

Sea clutter at screen center

A/C SEA adjusted;

sea clutter suppressed

Effect of A/C SEA

2-3

2. RADAR OPERATION

2.5.2 Adjusting the A/C SEA

A/C SEA should be adjusted so that the clutter is broken up into small dots, and small targets become distinguishable.

1. Press the GAIN key.

2. Press the A/C SEA soft key to show the A/C SEA setting window.

A/C SEA

AUTO ROUGH

AUTO MODERATE

AUTO CALM

MAN

A/C SEA setting window

3. Use the Cursor pad to select AUTO ROUGH, AUTO MODERATE, AUTO CALM, or

MAN (manual) as appropriate. Select an AUTO option according to the sea state.

4. For manual adjustment, rotate the ENTER knob to adjust. The range of adjustment is

0-100. Do not overadjust – weak echoes may be missed.

5. Press the GAIN key on the front panel or RETURN soft key to finish.

2.6 Reducing Precipitation Clutter

The vertical beamwidth of the antenna is designed to see surface targets even when the ship is rolling. However, by this design the unit will also detect precipitation clutter (rain, snow, hail, etc.) in the same manner as normal targets. Precipitation clutter shows as random dots on the screen.

When echoes from precipitation mask solid targets, adjust the A/C RAIN to split up these unwanted echoes into a speckled pattern, making recognition of solid targets easier.

1. Press the GAIN key.

2. Press the A/C RAIN soft key to show the A/C RAIN window.

A/C RAIN

A/C RAIN setting window

3. Rotate the ENTER knob to adjust the A/C RAIN. The current level is shown on the A/C

RAIN level bar in the A/C RAIN window, and the range of adjustment is 0 to 100(%). Do not overadjust – weak echoes may be missed.

4. Press the GAIN key on the front panel or RETURN soft key to finish.

2-4

2. RADAR OPERATION

2.7 Range Scale

The range setting determines the size of the area (in nautical miles) that will appear on your display. In addition, the range setting will also automatically adjust the range ring interval so that accurate range measurements may be made while operating on any range setting.

The range, range ring interval and pulselength appear at the top left-hand corner of the display.

Press the [RANGE (+ or -)] key to change the range scale.

Range scales (nm, sm)

Range 0.125 0.25 0.5 0.75 1 1.5 2 3 4 6 8 12 16 24 36 48 64 72

Ring Interval

No. of Rings

0.0625 0.125 0.125 0.25 0.25 0.5 0.5 1 1 2 2 3 4 6 12 12 16 18

2 2 5 4 5 4 5 4 5 4 5 5 5 5 4 5 5 5

Range scales ( km)

Range 0.25 0.5 0.75 1 1.5 2 3 4 6 8 12 16 24 36 48 64 72

Ring Interval 0.125 0.25 0.25 0.25 0.5 0.5 1 1 2 2 3 4 6 12 12 16 18

No. of Rings 2 2 4 5 4 5 4 5 4 5 5 5 5 4 5 5 5

Note 1: Maximum range depends on the network radar as shown below.

Model 1724C, 1734C, 1824C: 24 nm Model 1834C: 36 nm Model 1934C: 48 nm Model 1944C: 64 nm Model 1954C, 1964C: 72 nm

Note 2: You may choose which ranges to use from the RADAR RANGE SETUP menu. For details see paragraph 7.2.2. This function is not available with the GD-1720C.

2-5

2. RADAR OPERATION

2.8 Pulselength

The pulselength in use is displayed at the upper left corner of the display. Appropriate pulselengths are preset to individual range scales. Therefore, you are not usually required to select them. If you are not satisfied with the current pulselength setting, however, it is possible to change it for the ranges shown below. Generally, select a longer pulse for longer detection range and shorter pulse for better range discrimination.

1.5 nm, 1.5 sm, 3 km: Short pulse, medium pulse 3 nm, 3 sm, 6 km: Medium pulse, long pulse

1. If not displayed, press the HIDE/SHOW key to show the radar soft keys.

2. Press the SIGNAL PROC. soft key.

.500nm SP

1.5/ 319.9

H-UP

SIGNAL PROCESS

I. REJ

LOW

PULSE

SHORT

E. STR

LOW

RETURN

359.9°R

1.40nm

Signal process soft keys

3. Choose the 1.5 nm or 3 nm with the RANGE key.

4. Press the PULSE soft key to select the pulselength setting. SHORT or MEDIUM for 1.5 nm, 1.5 sm, 3 km and MEDIUM or LONG for 3 nm, 3 sm, 6 km.

5. Press the RETURN soft key to finish.

2-6

2. RADAR OPERATION

2.9 Presentation Mode

This unit provides four radar presentation modes: head-up, course-up, north-up and true motion.

Heading data is required for modes other than head-up.

2.9.1 Selecting a presentation mode

1. If not displayed, press the HIDE/SHOW key to show the radar soft keys.

2. Press the RADAR DISPLY soft key to show the RADAR DISPLAY soft keys.

3. Press the MODE soft key. Each pressing of the key changes the presentation mode and the presentation mode indication in the sequence of North-up, True Motion, Head-up, and Course-up.

Function Indicator on display Soft key label

North-up N-UP NTH UP True Motion TR-M TRUE M Head-up H-UP HD UP Course-up C-UP CSE UP

4. Press the RETURN soft key to finish.

Note: When heading data is lost, the presentation mode automatically goes to head-up, the heading indication at the screen top shows “- - -.-°” and the audio alarm sounds. Press the ALARM key to acknowledge the alarm. The message “HEADING DATA MISSING” appears. Restore compass signal to show heading indication. Use the CLEAR key presentation mode if necessary. The audio alarm may be silenced with the CLEAR key.

2-7

2. RADAR OPERATION

2.9.2 Description of presentation modes

Head-up

A display without azimuth stabilization in which the line connecting the center with the top of the display indicates own ship’s heading. Targets are painted at their measured distances and in their directions relative to own ship’s heading.

The short line on the bearing scale is the north marker.

Course-up

The radar picture is stabilized and displayed with the currently selected course at the top of the screen. As you change heading, the ship’s heading line moves. If you select a new course, the picture resets to display the new course at the top of the display.

Targets are painted at their measured distances and in their directions relative to the intended course which is maintained at the 0-degree position. The heading line moves in accordance with ship’s yawing and course changes.

North-up

North Marker

Head-up display

Course-up display

North

Heading Line

In the north-up mode, targets are painted at their measured distances and in their true (compass) directions from own ship. North is maintained at the top of the screen. The heading line changes its direction according to ship’s heading.

True motion

Fixed radar targets maintain a constant position on the screen, while your own ship moves across the radar image at the correct speed and heading. A map-like image is displayed, with all moving vessels traveling in true perspective to each other and to fixed landmasses. As your ship’s position approaches the edge of the screen, the radar display is automatically reset to reveal the area ahead of your ship. You can manually reset your ship’s position at any time by pressing the RADAR DISPLY soft key followed by the SHIFT soft key.

North-up display

North

Heading Line

True motion display

2-8

2. RADAR OPERATION

2.10 Measuring the Range

You can measure the range to a radar target three ways: by the range rings, by the cursor, and by the VRM (Variable Range Marker).

2.10.1 Measuring range by range rings

Count the number of rings between the center of the display and the target. Check the range ring interval and judge the distance of the echo from the inner edge of the nearest ring.

To turn the range rings on, do the following:

1. If not displayed, press the HIDE/SHOW key to show the radar soft keys.

2. Press the RADAR DISPLY soft key.

3. Press the RINGS soft key to turn the rings on and select desired brilliance.

4. Press the RETURN soft key to finish.

2.10.2 Measuring range by cursor

Operate the Cursor pad to place the cursor intersection on the inside edge of the radar target. The range to the target, as well as the bearing, appears to the right of “+” at the bottom of the display.

Target

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H-UP

Cursor

SIGNAL PROC.

RADAR DISPLY

NAV FUNC

TARGET

ZOOM & D. BOX

4.3°R

0.240nm

Bearing and range from own ship to cursor position

How to measure range to a target with the cursor

2-9

2. RADAR OPERATION

2.10.3 Measuring range by VRM

1. Press the EBL/VRM key to display the EBL/VRM soft keys.

2. Press the VRM1 ON (dotted ring VRM) or VRM2 ON (dashed ring VRM) soft key to select the desired VRM. The selected VRM’s indication, at the bottom of the screen, is highlighted.

3. Rotate the ENTER knob then place the VRM on the inside edge of a radar target. Read the VRM indication to find range to the target.

VRM1

(Dotted line)

VRM2

(Dashed line)

VRM1 range

VRM2 range

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H-UP

EBL1

---.-°R VRM1

0.119nm

EBL2

---.-°R VRM2

0.242nm

EBL VRM

EBL1 ON

VRM1 ON

OFFSET

EBL2 ON

VRM2 ON

359.9°R

0.240nm

Active marker is highlighted.

How to measure range with the VRM

4. You may hide the EBL/VRM soft keys by pressing the EBL/VRM key.

2.10.4 Various VRM operations

Erasing a VRM, VRM indication: Press appropriate VRM soft key, then press the CLEAR

key. The VRM is erased and its indication becomes blank.

Erasing EBL/VRM data boxes: Press the EBL or VRM soft key associated with the EBL/VRM data box you wish to erase. Press the CLEAR key once or twice to erase the data box.

Hiding EBL/VRM data boxes: Press the ZOOM & D. BOX and D. BOX ON/OFF soft keys to show or hide the EBL/VRM data boxes.

Moving EBL/VRM data boxes: When an EBL/VRM data box is obscuring a target you want to see, you can move it to another location as shown below. This cannot be done when the EBL/VRM soft keys are shown.

1. Press the EBL/VRM key to turn off the EBL/VRM soft keys.

2. Using the Cursor pad, place the cursor inside the data box you wish to move. As the cursor enters the box it changes to a “hand.” Push the ENTER knob, and the hand changes to a fist, meaning the box is correctly selected.

3. Use the Cursor pad to move the data box to the location desired, then push the ENTER knob.

2-10

2. RADAR OPERATION

2.11 Measuring the Bearing

There are two ways to measure the bearing to a target: by the cursor, and by the EBL (Electronic bearing Line).

2.11.1 Measuring bearing by cursor

Use the Cursor pad to place the cursor at the center of the target. The bearing to the target appears in the range and bearing box at the bottom right-hand corner on the screen.

2.11.2 Measuring bearing by EBL

1. Press the EBL/VRM key.

2. Press the EBL1 ON (dotted line EBL) or EBL2 ON (dashed line EBL) soft key to select the desired EBL. The selected EBL’s indication, at the bottom of the screen, is highlighted.

3. Rotate the ENTER knob to bisect the radar target with the EBL. Read the EBL indication to find the bearing to the target.

EBL1

(Dotted line)

EBL2

(Dashed line)

EBL2 bearing

EBL1 bearing

R: Relative

T: True

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EBL1

330.1°R VRM1

-.---nm

EBL2

234.1°R VRM2

-.---nm

Active marker is highlighted.

EBL VRM

EBL1 ON

VRM1 ON

OFFSET

EBL2 ON

VRM2 ON

359.9°R

0.24nm

How to measure bearing with the EBL

4. You may hide the EBL/VRM soft keys by pressing the EBL/VRM key.

Note: The bearing to a target may be shown relative to own ship’s heading (Relative) or

True bearing (requires heading data). This may be done with “EBL REFERENCE,” which is in the RADAR DISPLAY SETUP menu.

2.11.3 Various EBL operations

Erasing an EBL, EBL indication: Press appropriate EBL soft key, then press the CLEAR

key. The EBL is erased and its indication becomes blank.

Erasing, hiding, moving EBL/VRM data boxes: See paragraph 2.10.4.

2-11

2. RADAR OPERATION

2.12 Erasing the Heading Line, North Marker

The heading line indicates the ship's heading in all presentation modes. It is a line from the own ship position to the outer edge of the radar display area and appears at zero degrees on the bearing scale in head-up mode; it changes its orientation in the north-up, course-up and true motion modes with ship’s movement.

The north marker appears as a short dashed line. In the head-up and course-up modes the north marker moves around the bearing scale as the ship’s heading moves.

To temporarily erase the heading line and north marker, press the RADAR DISPLY soft key followed by the HL OFF soft key. Release the key to redisplay the markers. (If the radar soft keys are not shown, hit the HIDE/SHOW key to display them.)

2.13 Reducing Noise Interference

Noise, appearing on the displays as random “speckles,” can be reduced as follows:

1. Press the MENU key to open the menu.

2. Press the RADAR DISPLAY SETUP soft key.

3. Select NOISE REJECTION, then press the EDIT soft key.

4. Select OFF, LOW or HIGH as appropriate.

5. Press the ENTER soft key.

6. Press the MENU key to close the menu.

2-12

2. RADAR OPERATION

2.14 Rejecting Radar Interference

Radar interference may occur when near another shipborne radar that is operating in the same frequency band as your radar. Its on-screen appearance looks like many bright dots either scattered at random or in the form of dotted lines extending from the center to the edge of the display. Interference effects are distinguishable from normal echoes because they do not appear in the same place on successive rotations of the scanner.

Be sure to turn off the interference rejector when no interference exists – weak targets may be missed.

Radar interference

1. If not displayed, press the HIDE/SHOW key to show the radar soft keys.

2. Press the SIGNAL PROC. soft key.

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H-UP

SIGNAL PROCESS

I. REJ

LOW

E. AVG

OFF

PULSE

SHORT

E. STR

LOW

RETURN

359.9°R

1.40nm

SIGNAL PROCESS soft keys

3. Press the I. REJ soft key successively to choose the interference rejection level desired; LOW, MED, HIGH or OFF.

4. Press the RETURN soft key to finish.

The display shows IR L (Low), IR M (Medium) or IR H (High) when the interference rejector is on.

2-13

2. RADAR OPERATION

2.15 Zoom

The zoom feature allows you to double the size of the area selected with the “zoom square.” It is available on any range but is inoperative in true motion and when the display is shifted.

2.15.1 Zooming radar targets

This function is available when TARGET ID NUMBER is ON.

1. If not displayed, press the HIDE/SHOW key to show the radar soft keys.

2. Use the Cursor pad to set the cursor where you want to zoom.

3. Press the ZOOM & D. BOX soft key to show ZOOM & D. BOX soft keys.

4. Press the ZOOM ON/OFF soft key to select ON. A hollow square, called the “zoom area,” appears on the display.

5. To release the cursor, press the CURSOR FLOAT soft key. (The hollow square changes to a dashed one.) To relocate the zoom circle, select location with the Cursor pad, then press the CURSOR LOCK key.

6. To quit the zoom function, press the ZOOM ON/OFF soft key to select OFF.

Zoom circle

Zoom window

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H-UP

ZOOM D. BOX

ZOOM

ON /OFF

CURSOR

FLOAT

ARPA TGT ZM

D. BOX ON/OFF

RETURN

001.0°R

0.160nm

Requires optional ARP Board in 18x4C/19x4C series network radar. Not shown when radar source is otherwise.

Zoom

2.15.2 Zooming ARP, TTM targets

You may zoom in on TTM (Tracked Target Message) and ARP targets. TTM targets can come from a NavNet connected radar, or from other ARP radar that is outputting the TTM message. (TTM is a NMEA 0183 data sentence that is an available output from some ARP capable radar.) Target numbers must be turned on to use this function. This can be done by enabling the target ID number option in the ARP SETUP menu.

1. If not displayed, press the HIDE/SHOW key to show the radar soft keys.

2. Press the ZOOM/D. BOX soft key to show ZOOM & D. BOX soft keys.

3. Press the ZOOM ON/OFF soft key to select ZOOM ON.

4. Press the ARP TGT ZM soft key.

2-14

2. RADAR OPERATION

SELECT TARGET NO.

▲

▼

Target no. selection window

5. Use the ENTER knob to select number (1-10), then push the ENTER knob. If the target

number does not exist several beeps sound and the zoom function is cancelled.

To cancel, press the CURSOR LOCK soft key.

Note: The zoom window blends in with the background when the background color for the radar picture is white. If the window is difficult to see, change the background color.

2.16 Shifting the Picture

Own ship position, or sweep origin, can be displaced manually or automatically to expand the view field without switching to a larger scale. Zoom is not available when the display is shifted.

2.16.1 Manual shift

SHIFT

The sweep origin can be shifted in any presentation mode to a point specified by the cursor by up to 50% of the range in use in any direction.

Cursor

1. Locate the cursor anywhere within the effective radius of the display.

2. If not displayed, press the HIDE/SHOW key to show the

Place cursor where desired.

Press the MANUAL soft key.

Manual shift

radar soft keys.

3. Press the RADAR DISPLY soft key.

4. Press the SHIFT soft key.

5. Press the MANUAL soft key to shift. The heading line shifts to the cursor location. SHIFT appears at right-hand corner of the display.

To cancel shift, press the RADAR DISPLY, SHIFT and OFF soft keys.

2.16.2 Automatic shift

The amount of automatic shift is calculated according to ship’s speed, and the amount of shift is limited to 50% of the range in use. For example, if you set the shift speed setting for 15 knots and the ship is running at 10 knots the amount of shift will be about 34%. The formula for determining shift amount is as shown above. Automatic shift mode is only available in the head-up mode.

Ship's speed Shift speed setting

X 0.5 = Amount of shift(%)

2-15

2. RADAR OPERATION

Setting automatic shift maximum speed

1. If not displayed, press the HIDE/SHOW key to show the radar soft keys.

2. Press the RADAR DISPLY soft key.

3. Press the SHIFT soft key to show the shift soft keys.

4. Press the AUTO S.SPD soft key to display the auto ship speed setting window.

5. Adjust the Cursor pad or ENTER knob to set the maximum speed of your vessel, and then push the ENTER knob or the ENTER soft key to set. The setting range is 1-99 kt and the default setting is 15 kt.

Automatic shift

Press the AUTO soft key. To cancel, press the RADAR DISPLY, SHIFT and OFF soft keys.

AUTO SHIP SPEED

2.17 Using the Offset EBL

The offset EBL can be used to predict a potential collision course. It can also be used to measure the range and bearing between two targets.

2.17.1 Predicting collision course

The procedure below may be used to check if a radar target is on a potential collision course with your vessel.

1. Press the EBL/VRM key to show the EBL/VRM soft keys.

2. Press the EBL1 ON soft key to turn on the EBL1.

3. Press the OFFSET soft key. The origin of EBL1 moves to the cursor position, which is marked with an “X.”

4. Use the Cursor pad to place the cursor on the radar target which looks like it might be on a collision course with own ship.

5. Push the ENTER knob to fix the origin position.

6. After waiting for a few minutes (at least three minutes), rotate the ENTER knob so the EBL bisects the target at the new position. If the target tracks along the EBL towards the center of the display (your ship’s position), the target may be on a collision course with your vessel.

To cancel the offset EBL, press the OFFSET soft key.

2-16

2. RADAR OPERATION

Target tracked here

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H-UP

EBL VRM

EBL1 ON

VRM1 ON

OFFSET

Initial target position

EBL1

45.0°R VRM1

-.---nm

EBL2 ON

VRM2 ON

359.9°R

.0.240nm

Predicting collision course with the offset EBL

2.17.2 Measuring range & bearing between two targets

The procedure which follows shows how to measure the range and bearing between two targets, using the targets “A” and “B” in the figure below as an example.

1. Operate the Cursor pad to place the cursor on the target “A.”

2. Press the EBL/VRM key to show the EBL/VRM soft keys.

3. Press the EBL1 ON soft key to turn on the EBL1.

4. Press the OFFSET soft key. The origin of EBL1 moves to the cursor position, which is marked with an “X.”

5. Rotate the ENTER knob so the EBL bisects the target “B.”

6. Push the ENTER knob, then press the VRM1 ON soft key.

7. Rotate the ENTER knob to place the VRM1 on the inner edge of the target “B.”

8. Look at the indications for VRM1 and EBL1 to find the range and bearing between the two targets.

2-17

2. RADAR OPERATION

To cancel the offset EBL, press the OFFSET soft key.

Target B

Target A

Bearing and range between target A and target B

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H-UP

EBL1

45.0°R VRM1

0.125nm

EBL VRM

EBL1 ON

VRM1 ON

OFFSET

EBL2 ON

VRM2 ON

359.9°R

0.24nm

Measuring range and bearing between two targets

2.18 Echo Trails

Echo trails are simulated afterglow of target echoes that represent their movements relative or true to own ship. This function is useful for alerting you past possible collision situations.

Echo trail

Sample echo trails

2.18.1 Trail time

1. If not displayed, press the HIDE/SHOW key to show the radar soft keys.

2. Press the TARGET soft key.

3. Press the TRAIL soft key to show the trail soft keys.

2-18

2. RADAR OPERATION

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TRAIL

H-UP

TRAIL

ON /OFF

TRAIL TIME

GRAD

SINGLE

HIGH

TRAIL COLOR

RETURN

359.9°R

0.24nm

Trail soft keys

4. Press the TRAIL TIME soft key to show the trail time window.

TRAIL TIME

▲

15 seconds

{

30 seconds

{

1 minute

{

3 minutes

{

6 minutes

{

15 minutes

{

30 minutes

{

CONTINUOUS

▼

Trail time window

5. Use the Cursor pad to select time desired.

6. Press the ENTER soft key.

7. Press the RETURN soft key twice to finish.

2.18.2 Starting echo trails

1. If not displayed, press the HIDE/SHOW key to show the radar soft keys.

2. Press the TARGET soft key.

3. Press the TRAIL soft key.

4. Press the TRAIL ON/OFF soft key to select ON.

5. Press the RETURN soft key twice to finish.

“TRAIL,” the echo trail time selected and elapsed time appear at the top right-hand corner of the display. Then, afterglow starts extending from all targets. Trails are restarted when the range or mode is changed and zoom or shift is turned on.

For continuous trails, the maximum continuous trail time is 99 minutes and 59 seconds. When the elapsed time clock counts up to that time, the elapsed time display resets to zero and trails begin again.

To turn off echo trail, press the TRAIL ON/OFF soft key to select OFF at step 4 in the above procedure.

Trails are restarted when the range or mode is changed and zoom or shift is activated.

2-19

2. RADAR OPERATION

2.18.3 Trail gradation

The echo trails can be shown in single or multiple gradations. Multiple gradation paints the trails thinner with time, like the afterglow on an analog PPI radar.

1. If not displayed, press the HIDE/SHOW soft key to show the radar soft keys.

2. Press the TARGET and TRAIL soft keys.

3. Press the GRAD soft key to select SINGLE or MULTI as appropriate.

4. Press the RETURN soft key twice to finish.

Multitone Monotone

2.18.4 Trail color

Trails may be shown target trails in blue, yellow, green or white.

1. If not displayed, press the HIDE/SHOW key to show the radar soft keys.

2. Press the TARGET, TRAIL and TRAIL COLOR soft keys in that order.

TRAIL COLOR

BLUE YELLOW GREEN WHITE

Trail color window

3. Use the Cursor pad to select the color desired, then press the ENTER soft key.

4. Press the RETURN soft key twice.

2-20

2. RADAR OPERATION

2.19 Echo Stretch

Normally, the reflected echoes from long range targets appear on the display as weaker and smaller blips even though they are compensated by the radar’s internal circuitry. The echo stretch function magnifies these small blips in all ranges. Two types of echo stretch are available: ES LOW which stretches echoes in bearing direction and ES HIGH which stretches them in both range and bearing directions.

Target

Range

Bearing direction

direction

Bearing direction

Echo Stretch OFF

"LOW" Echo stretch "HIGH" Echo stretch

Types of echo stretch

This function magnifies not only targets but also sea clutter and radar interference. For this reason, be sure sea clutter and radar interference are properly suppressed before activating the echo stretch.

1. If not displayed, press the HIDE/SHOW key to show the radar soft keys.

2. Press the SIGNAL PROC. soft key.

3. Press the E. STR soft key to select HIGH, LOW or OFF as appropriate.

4. Press the RETURN soft key to finish.

The display shows ES H (High) or ES L (Low) when the echo stretch is on.

2-21

2. RADAR OPERATION

2.20 Echo Averaging

The echo average feature, which requires a Model 18x4/19x4 series network radar as radar source, effectively suppresses sea clutter. Echoes received from stable targets such as ships appear on the screen at almost the same position during every rotation of the antenna. On the other hand, unstable echoes such as sea clutter appear at random positions.

To distinguish real target echoes from sea clutter, echo average performs scan-to-scan correlation. Correlation is made by storing and averaging echo signals over successive picture frames. If an echo is solid and stable, it is presented in its normal intensity. Sea clutter is averaged over successive scans resulting in the reduced brilliance, making it easier to discriminate real targets from sea clutter.

To properly use the echo average function, it is recommended to first suppress sea clutter with the A/C SEA control and then do the following:

1. If not displayed, press the HIDE/SHOW key to display the radar soft keys.

2. Press the SIGNAL PROC. soft key.

3. Press the E. AVG soft key to select desired echo averaging.

OFF: No averaging

LOW: Helps distinguish targets from sea clutter and suppresses brilliance of unstable

echoes.

MED: Distinguishes small stationary targets such as navigation buoys.

HIGH: Stably displays distant targets.

4. Press the RETURN soft key to finish.

(a) Echo average OFF (b) Echo average ON

Effect of echo averaging

2-22

2. RADAR OPERATION

2.21 Outputting TLL Data

Target position data can be output to units of the network and shown on their plotter screen with the TLL mark (X). This function requires position and heading data.

1. Operate the Cursor pad to place the cursor on the target whose position you wish to output.

2. If not displayed, press the HIDE/SHOW key to display the radar soft keys.

3. Press the TARGET soft key.

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TARGET

H-UP

TRAIL

TLL OUTPUT

ACQ

TARGET INFO

RETURN

359.9°R

0.240nm

Shown with selection of 18x4C/19x4C series network radar equipped with ARP function as source. Not shown otherwise.

TARGET soft keys

4. Press the TLL OUTPUT soft key to output target position data. The TLL mark appears on the plotter screen at the target’s position the moment the TLL OUTPUT soft key was pressed. Further, that position is recorded as a waypoint on all NavNet units, under the youngest empty waypoint number on each NavNet unit.

5. Press the RETURN soft key to finish.

Note: The screen of the TLL recipient may be temporarily interrupted when receiving TLL from another NavNet display unit. Press any key to restore normal operation.

2-23

2. RADAR OPERATION

2.22 Guard Alarm

The guard alarm allows the operator to set the desired range and bearing for a guard zone. When ships, islands, landmasses, etc. violate the guard zone, an audio alarm sounds and the offending target blinks to call the operator’s attention.

CAUTION

• The alarm should not be relied upon as

the sole means for detecting possible collision situations.

• A/C SEA, A/C RAIN and GAIN controls should be properly adjusted to be sure the alarm system does not overlook target echoes.

2.22.1 Setting a guard alarm zone

To set a guard alarm zone, set the radar to transmit and do the following:

1. Press the ALARM key.

2. Use the Cursor pad to set the cursor on the top left corner (or top right corner) of the

guard zone you want to set, then press the SET GUARD1 or SET GUARD2 soft key, depending on which guard zone you want to set.

3. Use the Cursor pad to set the cursor on the bottom right corner (or top left corner) of the guard zone area, then push the ENTER knob.

4. Press the RETURN soft key to finish.

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ALARM

H-UP

SET GUARD1

SET GUARD2

RETURN

MOVE +CURSOR TO ANOTHER CORNER OF GUARD1 AND PUSH KNOB TO SET.

317.2°R

0.230nm

(1) Drag cursor to top (or bottom) corner for guard zone and press the SET GUARD1 or SET GUARD2 soft key.

How to set a guard alarm zone

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H-UP

NO ALARM

19.9

.125n

.032nm

39.9°R

.0.230nm

ALARM GUARD 1

SET GUARD1

ERASE GUARD1

SET GUARD2

RETURN

(2) Drag cursor diagonally to bottom (or top) corner for guard zone and press the [ENTER] knob.

2-24

2. RADAR OPERATION

The equipment then searches for targets inside the guard zone to determine guard alarm type. If a target is found inside the guard zone, the guard zone type becomes an “Outward guard alarm,” and any target exiting the guard zone will trigger the audio alarm. If no target is found, the guard zone type becomes an “Inward guard alarm,” and any targets entering the guard zone will trigger the audio alarm. The guard alarm type is shown as G1(G2) IN or G1(G2) OUT. Note 1: When the radar range is less than the guard zone range “G1 (G2) IN” or “G1 (G2) OUT” changes to “G1 (G2) ***.” The guard alarm function is not available while this indication appears.

Note 2: If the network radar is set to standby while the guard alarm is active, the guard alarm is cancelled. The guard alarm is redisplayed when the radar is set to transmit again.

2.22.2 When the alarm is violated…

Any radar target violating the guard zone will flash, the audio alarm sounds, and the alarm icon appears in red. Additionally the message “TARGET ENTERED INTO GUARD1(GUARD2)” or “TARGET LEFT FROM GUARD1(GUARD2)” is displayed at the bottom of the screen. Press the CLEAR key to silence the alarm.

2.22.3 Cancelling the guard alarm

1. Press the ALARM key to show the ALARM menu.

2. Press the ERASE GUARD1 or ERASE GUARD2 soft key as appropriate.

3. Press the RETURN soft key to finish.

2.23 Watchman

2.23.1 How watchman works

The watchman function periodically transmits radar pulses for one minute to check for targets in a guard zone. If a target is found in the zone, watchman is cancelled, the audio alarm sounds and the radar continues transmitting. If no target is found the radar goes into standby for the number of minutes specified on the RADAR DISPLAY SETUP menu. This feature is useful when you do not need the radar’s function continuously but want to be alerted to radar targets in a specific area. “WTCH” appears at the top left corner when Watchman is active.

1 min

Watchman starts

ST-BY

5,10 or 20 min

* Beeps emitted just before radar transmits.

1 min

ST-BY

5,10 or 20 min

How watchman works

2-25

2. RADAR OPERATION

2.23.2 Turning on/off watchman

1. Set a guard zone. (See the paragraph 2.22.)

2. If not displayed, press the HIDE/SHOW key to display the radar soft keys.

3. Press the NAV FUNC soft key.

4. Press the W. MAN ON/OFF soft key to select ON or OFF as appropriate.

5. Press the RETURN soft key to finish.

Note: When the watchman is activated and no guard zone is active, the message “PLEASE SET GUARD ZONE. PUSH ANY KEY TO CONTINUE.” appears. Press any key and then set a guard zone.

2.23.3 Setting watchman stand-by interval

The watchman standby interval, that is, the number of minutes the radar is in standby, can be set to 5, 10 or 20 minutes as follows:

1. Press the MENU key.

2. Press the RADAR DISPLAY SETUP soft key.

3. Select WATCHMAN TIME, then press the EDIT soft key.

WATCHMAN TIME



5 minutes

¡

10 minutes

20 minutes

Watchman time window

4. Select time desired, then press the ENTER soft key.

5. Press the MENU key to close the menu.

2-26

2. RADAR OPERATION

2.24 Waypoint Marker

A waypoint marker, showing the location of the destination waypoint set on the plotter, may be inscribed on the radar display.

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H-UP

Waypoint marker

NAV FUNC

W. MAN ON/OFF

WPT MK

ON /OFF

RETURN

359.9°R

0.24nm

Waypoint marker

1. If not already shown, press the HIDE/SHOW key to display the radar soft keys.

2. Press the NAV FUNC soft key.

3. Press the WPT MK ON/OFF soft key to select ON or OFF as appropriate.

4. Press the RETURN soft key to finish.

2-27

2. RADAR OPERATION

2.25 ARP, TTM Operation

When the radar source is an ARP-equipped Model 18x4/19x4 series network radar, you can manually and automatically acquire and track ten targets. Once a target is acquired automatically or manually it is automatically tracked within 0.1 to 32 nm. If the FURUNO heading sensor PG-1000 is used, the data sentence “RMC” is necessary.

Alternatively, you can display the tracks of other ships by receiving the data sentence TTM (Tracked Target Message) via the NETWORK or NMEA port on the display unit. However, targets cannot be acquired.

Note: When using your unit as remote display, you cannot change the range of the main radar at the remote display. For the target acquisition, set the range individually.

Usage precautions for ARP

CAUTION

No one navigational aid should be relied upon for the safety of vessel and crew. The navigator has the responsibility to check all aids available to confirm position. Electronic aids are not a substitute for basic navigational principles and common sense.

• This auto plotter automatically tracks an automatically or manually acquired radar target and calculates its course and speed, indicating them by a vector. Since the data generated by the auto plotter are based on what radar targets are selected, the radar must always be optimally tuned for use with the auto plotter, to ensure required targets will not be lost or unwanted targets such as sea returns and noise will not be acquired and tracked.

• A target does not always mean a land mass, reef, ships or other surface vessels but can imply returns from sea surface and clutter. As the level of clutter changes with environment, the operator should properly adjust the A/C SEA, A/C RAIN and GAIN controls to be sure target echoes are not eliminated from the radar screen.

CAUTION

The plotting accuracy and response of this auto plotter meets IMO standards. Tracking accuracy is affected by the following:

• Tracking accuracy is affected by course change. One to two minutes is required to restore vectors to full accuracy after an abrupt course change. (The actual amount depends on gyrocompass specifications.)

• The amount of tracking delay is inversely proportional to the relative speed of the target. Delay is on the order of 15-30 seconds for high relative speed; 30-60 seconds for low relative speed.

Display accuracy is affected by the following:

• Echo intensity

• Radar transmission pulsewidth

• Radar bearing error

• Gyrocompass error

• Course change (own ship or target)

2-28

2. RADAR OPERATION

2.25.1 Activating/deactivating ARP, TTM

1. Press the MENU key followed by the ARP SETUP soft key to show the ARP SETUP

menu.

ARP

ARP TARGET INFO

INTERNAL ARP

CANCEL ALL TARGETS

ARP VECTOR MODE

RELATIVE

ARP VECTOR TIME

30 minutes

HISTORY INTERVAL

OFF

CPA

OFF

TCPA

30 seconds

AUTO ACQUISITION AREA

OFF TARGET ID NUMBER OFF

SETUP

EDIT

RETURN

ARP setup menu

2. Select ARP TARGET INFO, then press the EDIT soft key to show the ARP TARGET INFO window.

ARP TARGET INFO

▲

INTERNAL ARP

EXTERNAL ARP

OFF

▼

ARP TARGET INFO window

3. Select INTERNAL ARP, EXTERNAL ARP or OFF as appropriate. EXTERNAL ARP: Receive TTM data sentence via NMEA or NETWORK port. Target

tracks are shown but targets cannot be acquired. OFF: Turns off the ARP or TTM display.

4. Press the ENTER soft key.

5. Press the MENU key to close the menu.

2.25.2 Acquiring and tracking targets (ARP)

Ten targets may be acquired and tracked manually and automatically. When you attempt to acquire an 11th target, the message “ARP FULL – ALREADY TRACKING 10 TARGETS!” appears for five seconds. To acquire another target, terminate tracking of an unnecessary target as shown in the paragraph “2.25.4 Terminating tracking of ARP targets.”

Manual acquisition

When the automatic acquisition (AUTO ACQ. AREA) is set to on, up to five targets may be acquired manually. If you attempt to acquire a sixth target, the alert message appears.

1. If not already shown, press the HIDE/SHOW key to show the radar soft keys.

2-29

2. RADAR OPERATION

2. Press the TARGET soft key.

3. Place the cursor on the target to acquire.

4. Press the ACQ soft key.

5. Press the RETURN soft key to finish.

The plot symbol changes over time as below. A vector appears about one minute after acquisition, indicating the target’s motion trend.

Vector

01*

At acquisition 1 min. after

acquisition

* = Target number shown when TARGET ID NUMBER is turned on in the ARP SETUP menu.

01*

3 min. after acquisition

01*

Target Number

ARP plot symbols

Note: In case of the acquisition by an external ARP, the acquisition circle mark appears one minute after acquisition.

Automatic acquisition

The ARP can acquire up to ten targets automatically by setting an automatic

Automatic acquisition area

acquisition area. When automatic acquisition is selected after acquiring targets manually, only the remaining capacity for targets may be

45° port

2.0 - 2.5 nm

45° starboard

automatically acquired. For example, if seven targets have been manually acquired, three targets may be automatically acquired.

1. Press the MENU key to show the main

Automatic acquisition area

menu.

2. Press the ARP SETUP soft key to show the ARP SETUP menu.

3. Operate the Cursor pad to select AUTO ACQUISITION AREA.

4. Press the EDIT soft key to show the automatic acquisition area window.

AUTO ACQ. AREA

▲

OFF

▼

Automatic acquisition area window

5. Select ON, then press the ENTER soft key.

6. Press the MENU key to close the menu. An acquisition area of 2.0 to 2.5 miles in range

and ±45º on either side of the heading line in bearing appears.

Note: Targets being tracked in automatic acquisition are continuously tracked when switching to manual acquisition.

2-30

CANCEL ALL TARGETS

▲

▼

YES NO

2.25.3 Displaying target number (ARP, TTM)

Target number can be shown for ARP and TTM targets as below.

2. RADAR OPERATION

.125nm SP

.250/ 319.9

H-UP

ARP Target Number

ARP target number

1. Press the MENU key.

2. Press the ARP SETUP soft key.

3. Select TARGET ID NUMBER.

4. Press the EDIT soft key.

5. Select ON or OFF as appropriate.

6. Press the ENTER soft key.

7. Press the MENU key to close the menu.

2.25.4 Terminating tracking of ARP targets

TARGET

TRAIL

TLL OUTPUT

ACQ

TARGET INFO

RETURN

359.9°R

0.240nm

When ten targets have been acquired, no more acquisition occurs unless targets are cancelled. If you need to acquire additional targets, you must first cancel one or more individual targets, or all targets, using one of the procedures below.

Terminating tracking of selected targets

1. Place the cursor on the target to terminate tracking.

2. Press the CLEAR key to terminate tracking and erase the target.

Terminating tracking of all targets

1. Press the MENU key followed by the ARP SETUP soft key.

2. Select CANCEL ALL TARGETS.

3. Press the EDIT soft key.

4. Select YES.

5. Press the ENTER soft key.

6. Press the RETURN soft key followed by the MENU key to close the menu.

2-31

Cancel all targets window

2. RADAR OPERATION

2.25.5 Setting vector attributes (ARP)

What is a vector?

A vector is a line extending from a tracked target which shows estimated speed and course of the target. The vector tip shows an estimated position of the target after the selected vector time elapses. It can be useful to extend the vector length (time) in order to evaluate the risk of collision with any target.

Vector

Vector reference, vector time

You may reference the vectors to North (True, requires heading and speed data) or ship’s heading (relative) as desired. Vector time can be set to 30 seconds, 1, 3, 6, 15 or 30 minutes.

1. Press the MENU key followed by the ARP SETUP soft key to show the ARP SETUP

menu.

2. Operate the Cursor pad to select ARP VECTOR MODE.

3. Press the EDIT soft key to show the ARP vector mode window.

ARP VECTOR MODE

RELATIVE TRUE

ARP vector mode window

4. Select TRUE or RELATIVE as appropriate.

5. Press the ENTER soft key.

6. Select ARP VECTOR TIME, then press the EDIT soft key to show the ARP vector time window.

ARP VECTOR TIME

▲

30 seconds

1 minute

3 minutes

6 minutes

15 minutes

30 minutes

▼

ARP vector time window

7. Operate the Cursor pad to select vector time among 30 sec, 1 min, 3 min, 6 min, 15 min and 30 min.

8. Press the ENTER soft key.

9. Press the MENU key to close the menu.

2-32

2. RADAR OPERATION

2.25.6 Displaying past position (ARP)

This ARP can display time-spaced dots (maximum ten dots) marking the past positions of any targets being tracked. You can evaluate a target’s actions by the spacing between dots. Below are examples of dot spacing and target movement.

(a) Ship turning

(b) Ship running straight

(d) Ship increased speed

Past position displays

To turn the past position display on or off:

1. Press the MENU key followed by the ARP SETUP soft key.

2. Operate the Cursor pad to select HISTORY INTERVAL.

3. Press the EDIT soft key to show the history interval window.

HISTORY INTERVAL

▲

OFF

30 seconds

1 minute

3 minutes

6 minutes

▼

History interval window

4. Operate the Cursor pad to select history interval among 30 sec, 1 min, 3 min and 6 min,

or select OFF to turn off the past position display.

5. Press the ENTER soft key.

6. Press the MENU key to close the menu.

2-33

2. RADAR OPERATION

2.25.7 ARP, TTM target data

You can show motion trends (range, bearing, course, speed, CPA and TCPA) for ARP or TTM targets.

1. Place the cursor on the target whose data you want to see.

2. If not already displayed, press the HIDE/SHOW key to show the radar soft keys.

3. Press the TARGET and TARGET INFO soft keys. The data of the selected target appears at the bottom left-hand corner of the display. (If an EBL/VRM data box is displayed the ARP (TTM) data box will be under it.)

4. Press the RETURN soft key to finish.

To erase ARP/TTM target data, select the corresponding target with the cursor, then press the CLEAR key.

Cursor

ARP Target

.125nm SP

.250/ 319.9

TARGET

H-UP

TRAIL

TLL OUTPUT

ACQ

TARGET INFO

RETURN

No.01 VECTOR TRUE 15min CSE 359.9°T SPD 12.5kt CPA 2nm TCPA 12.35

CPA and TCPA Course and Speed Target No., Vector Reference (True), Vector Time

ARP target data

359.9°R

0.240nm

2-34

2. RADAR OPERATION

2.25.8 CPA/TCPA alarm (ARP)

When the predicted CPA of any target becomes smaller than a preset CPA alarm range or its predicted TCPA less than a preset TCPA alarm limit, an audio alarm sounds and the speaker icon appears (in red). In addition, the target plot symbol of the offending target changes to a triangle and flashes together with its vector. You may silence the audio alarm with the CLEAR key. Press the ALARM key and the message “COLLISION ALARM” appears. Press the CLEAR ALARM soft key to acknowledge the alarm. The flashing of the triangle plot symbol continues until you intentionally terminate tracking of the target. The ARP continuously monitors the predicted range at the Closest Point of Approach (CPA) and predicted time to CPA (TCPA) of each track to own ship.

This feature helps alert you to targets which may be on a collision course with own ship. However, it is important that gain, A/C SEA, A/C RAIN and other radar controls are properly adjusted and the ARP is set up so that it can track targets effectively.

CPA/TCPA alarm ranges must be set up properly taking into consideration the size, tonnage, speed, turning performance and other characteristics of own ship.

CAUTION

The CPA/TCPA alarm should never be relied upon as the sole means for detecting the risk of collision. The navigator is not relieved of the responsibility to keep visual lookout for avoiding collisions, whether or not the radar or other plotting aid is in use.

Follow the steps shown below to set the CPA/TCPA alarm range:

1. Press the MENU key followed by the ARP SETUP soft

key.

2. Operate the Cursor pad to select CPA.

3. Press the EDIT soft key to show the CPA window.

4. Select a CPA limit desired from 0.5 nm, 1 nm, 2 nm, 3

nm, 5 nm and 6 nm with the Cursor pad.

5. Press the ENTER soft key. The ARP SETUP menu reappears.

6. Operate the Cursor pad to select TCPA.

7. Press the EDIT soft key to show the TCPA window.

8. Select a TCPA limit from 30 sec, 1 min, 2 min, 3 min, 4 min, 5 min, 6 min and 12 min.

9. Press the ENTER soft key.

10. Press the MENU key to close the menu.

CPA

▲

OFF

0.5nm

1nm

2nm

3nm

5nm

6nm

▼

CPA distance

TCPA

▲

30 seconds

1 minute

2 minutes

3 minutes

4 minutes

5 minutes

6 minutes

12 minutes

▼

TCPA time

2-35

2. RADAR OPERATION

2.25.9 Lost target alarm (ARP)

When the system detects a lost target, the target symbol becomes a diamond and tracking is discontinued after one minute.

Lost target mark

Canceling a lost target

1. Place the cursor on the target.

2. Press the CLEAR key.

2-36

2. RADAR OPERATION

Target B (True)

Target B (Spurious)

Target A

;

2.26 Interpreting the Radar Display

2.26.1 False echoes

Occasionally echo signals appear on the screen at positions where there is no target or disappear even if there are targets. False target situations may be recognized, however, if you understand why they are displayed. Typical false echoes are shown below.

Multiple echoes

Multiple echoes occur when a transmitted pulse returns from a solid object like a large ship, bridge, or breakwater. A second, a third or more echoes may be observed on the display at double, triple or other multiples of the actual range of the target as shown below. Multiple reflection echoes can be reduced and often removed by decreasing the gain (sensitivity) or properly adjusting the A/C SEA control.

Sidelobe echoes

Tr u e echo

Target

Own ship

Multiple echo

Multiple echoes

Every time the radar pulse is transmitted, some radiation escapes on each side of the beam. This stray RF is called a “sidelobe.” If a target exists where it can be detected by the sidelobes as well as the main lobe, the side echoes may be represented on both sides of the true echo at the same range. Sidelobes show usually only on short ranges and from strong targets. They can be reduced through careful reduction of the gain or proper adjustment of the A/C SEA control.

Virtual image

A relatively large target close to your ship may show at two positions on the screen. One of them is the true echo directly reflected by the target and the other is a false echo which is caused by the mirror effect of a large object on or close to your ship as shown in the figure below. If your ship comes close to a large metal bridge, for example, such a false echo may temporarily be seen on the screen. Virtual image

2-37

Sidelobe echoes

Target ship

Own ship

Tr u e echo

Mirror image of target ship

False echo

Virtual image

2. RADAR OPERATION

Shadow sector

Funnels, stacks, masts, or derricks in the path of the antenna block the radar beam. If the angle subtended

Radar antenna

at the antenna is more than a few degrees, a non-detecting sector or blind spot may be produced. Within this sector, targets can not be detected.

Radar mast

2.26.2 SART (Search and Rescue Transponder)

A Search and Rescue Transponder (SART) may be triggered by any X-Band (3 cm) radar within a range of approximately 8 nm. Each radar pulse received causes it to transmit a response which is swept repetitively across the complete radar frequency band. When

interrogated, it first sweeps rapidly (0.4 µs) through the band before beginning a relatively slow sweep (7.5 µs) through the band back to the starting frequency. This process is

repeated for a total of twelve complete cycles. At some point in each sweep, the SART frequency will match that of the interrogating radar and be within the pass band of the radar receiver. If the SART is within range, the frequency match during each of the 12 slow sweeps will produce a response on the radar display, thus a line of 12 dots equally spaced by about 0.64 nautical miles will be shown.

When the range to the SART is reduced to about 1 nm, the radar display may show also the 12 responses generated during the fast sweeps. These additional dot responses, which also are equally spaced by 0.64 nm, will be interspersed with the original line of 12 dots. They will appear slightly weaker and smaller than the original dots.

Screen B: When SART is close

Lines of 12 dots are displayed in concentric

1.5 NM

Own ship position

Radar receiver bandwidth

Position of SART

Screen A: When SART is distant

Echo from SART

24 NM

Own ship position

9500 MHz 9200 MHz

Sweep start

Radar antenna beamwidth

SART mark length

Sweep time

7.5 µs 95 µs

Low speed sweep signal

High speed sweep signal

Appearance of SART signal on the radar display

Echo from SART

Position of SART

2-38

2. RADAR OPERATION

General procedure for detecting SART response

1. Use the range scale of 6 or 12 nm as the spacing between the SART responses is about 0.6 nm (1125 m) to distinguish the SART.

2. Turn off the automatic clutter suppression (if applicable).

3. Turn off the Interference Rejector.

2.26.3 Racon (Radar Beacon)

A racon is a radar transponder which emits a characteristic signal when triggered by a ship’s radar (usually only the 3 centimeter band). The signal may be emitted on the same frequency as that of the triggering radar, in which case it is superimposed on the ship's radar display automatically.

The racon signal appears on the PPI as a radial line originating at a point just beyond the position of the radar beacon or as a Morse code signal (see figure below) displayed radially from just beyond the beacon.

Racon

Appearance of racon signal on the radar display

2-39

INDEX

This page is intentionally left blank.

2-40

3. PLOTTER OPERATION

3.1 Plotter Displays

You may show the plotter display over the entire screen, in the overlay screen with the radar display, or in a combination screen.

3.1.1 Full-screen plotter display

Scale

Icon (from left) North Marker Chart Alarm Track Hold Chart Offset Save L/L Offset Battery Simulation (See icon table on appendix for details.)

Nav data window

Presentation mode

(Data changes with NAV soft key setting and cursor status. For details see next page.)

34° 22. 3456'N 359.9° M 080° 22. 3456'E

16.0nm

S I M

002WP

FISH

19.9 kt 99.9 nm

BRIDGE

Own ship

Waypoint name

marker

Course bar

Waypoint marker

(North-up)

Trip distance

TRIP

MARK

ENTRY

MODE

NTH UP

NAV

POS

D. BOX ON/ OFF

Own ship track

Functions for soft keys

Full-screen plotter display

Note: When GPS signal error is found, the following occurs depending on the device feeding position data:

GPS Receiver GP-310B/320B: Alarm icon (

) appears and the aural alarm sounds. Own

ship marker blinks faster. Other navigator: The message “NO GPS FIX” appears and is accompanied by the aural alarm and alarm icon. If the GPS signal is missing for more than 90 seconds, the message “NO POSITION DATA” appears.

Nav data window

The data shown in the nav data window depends on the status of the NAV soft key and the cursor.

3-1

3. PLOTTER OPERATION

Latitude and longitude of cursor intersection

Waypoint data (waypoint selected with cursor)

Own ship position

NAV POS

soft key

Own Ship Mark Speed

Latitude, Longitude

34°24. 3456'N 359. 9°M

124°24. 3456'W 59.9nm 99. 9nm

Cursor Mark

001WPT

34°24. 3456'N 359. 9°M

Bearing to Cursor

TRIP

Range to Cursor

Trip Distance

CourseBearing to WaypointWaypoint Name

359. 9°M359. 9°M

19. 9nm 19. 9kt 99. 9nm

SpeedRange to WaypointWaypoint Mark Trip Distance

CourseLatitude, Longitude

TRIP

124°24. 3456'W 19. 9kt 99. 9nm

Trip Distance

Presentation Mode

Destination waypoint data

Own ship speed and course

Turns off nav data window

NAV WPT

soft key

NAV S/C

soft key

NAV OFF

soft key

Time-to-Go to Destination

Bearing to WaypointWaypoint Name

001WPT

Waypoint Mark

Course, Speed

CSE

359. 9°M 359. 9 °M 79. 9°F NU

SOG

19. 9kt 99. 9nm 345 ft

Range to Waypoint

Bearing to Waypoint

BRG RNG

Range to Waypoint

359. 9°M TTG4D02H23M NU

19. 9nm

ETA1st 13:45

Estimated Time of Arrival

TMP DPT

Water Temp.*, Depth*

* Requires appropriate sensor.

Contents of nav data window

Presentation Mode

3-2

3. PLOTTER OPERATION

3.1.2 Nav graphic display

The nav graphic display shows the compass display or the wind display depending on the setting of GRAPHIC METER in the NAV GRAPHIC DISPLAY SETUP menu. For further details see paragraph 7.10.

Compass display

The compass display, shown in combination displays, provides steering information. The compass rose shows two triangles: the red triangle shows own ship’s course and the black triangle, which moves with ship’s course, shows the bearing to destination waypoint.

The water temperature and depth graphs, which require appropriate sensors, show the latest 10 minutes of water temperature and depth data. The range of the depth graph is 50 feet and it is automatically adjusted with depth. You may adjust the update interval for these graphs on the NAV GRAPHIC DISPLAY SETUP menu.

Time-to-go to destination

Destination waypoint bearing (black and filled

on color model,

hollow on monochrome model)

Depth graph*

* = Requires appropriate sensor.

Destination waypoint

003WPT

0D 9H 59MTTG 23th23:59

DPT

45.2ft

Shown (in red on color model) when direction to steer is "left."

Bearing scale

Speed over ground

Range to destination waypoint

RNG

10.0

SOG

BRG

359.9°M

CSE

Own ship marker (For color model, black when within XTE range, yellow when over; flashes when over XTE range on monochrome model)

Speed through water

99.9nm

ETA

STW

TMP

16.2°F

10.0

Direction to steer (green on color model)

Estimated time of arrival at destination

Ship's course (red and filled

on color model, filled on monochrome model

Water temperature graph*

)

XTE monitor (See next page for description.)

Compass display

3-3

3. PLOTTER OPERATION

Reading the XTE (cross-track error) monitor

The XTE monitor, located below the compass rose, shows the distance you are off course and the direction to steer to return to course. The own ship marker moves according to direction and distance off course. It is shown in black when the amount of cross-track error is within the XTE monitor range and yellow when it is over. An arrow appears at the right or left side of the XTE monitor and it shows the direction to steer to return to intended course. It is shown in red when you should steer left, and green when you should steer right. In the example on the previous page you would steer right to return to course. To maintain course, steer the vessel so the own ship marker stays at the center of the XTE monitor.

Soft keys

You can show the soft keys for the compass display by pressing the HIDE/SHOW key.

EDIT XT-LMT: Sets the range for XTE monitor scale. See the procedure below for how to

set. RESET XTE: This soft key may be operated to restart navigation, when a destination is set. Press the EDIT XT-LMT soft key followed by the RESET XTE soft key. The following message is displayed.

RESTART NAVGATION TO CURRENT WPT. ARE YOU SURE? YES ... PUSH ENTER KNOB NO ... PUSH CLEAR KEY

Setting the range for the XTE monitor

1. With the compass (or highway) display shown, press the EDIT XT-LMT soft key to display the following window.

XTE LIMIT

0 .1nm

XTE range setting window

2. Use the Cursor pad to select digit to change. Note that all digits may be cleared by pressing the CLEAR key.

3. Enter value with the ENTER knob.

4. Push the ENTER knob to set, or press the CANCEL soft key to cancel.

3-4

3. PLOTTER OPERATION

4259nm

Anemometer display

The anemometer display shows mostly the same data as the compass display. The wind meter in the center of the display shows wind speed in the bow direction, in graphic and analog forms.

QP<01>

TTG

DPT

123ft 12.3°C

WIND SPEED

RNG

SOG

*D *H *M

4259nm

20.0kt ETA

WIND APPARENT

45°S

12.3kt

STW

TMP

20.2kt

* *: *

Anemometer display

3-5

3. PLOTTER OPERATION

3.1.3 Highway display

The highway display, shown in the combination display of radar/compass/highway and plotter/compass/highway, provides a graphic presentation of ship’s track along intended course. It is useful for monitoring ship’s progress toward a waypoint. The own ship marker shows the relation between ship and intended course. The XTE monitor shows the direction and amount your vessel is off course – the arrow shows the direction to steer to return to your course and the numeric the distance you are off course. Using the figure below as an example, you would steer right 0.009 nm to return to course. To maintain course, steer the vessel so the own ship marker stays aligned with the intended course line.

Destination

Time-to-go to destination

waypoint

WPT001

0D 9H 59MTTG 23th23:59ETA

Range to destination waypoint

RNG 99.9 nm

kt 10.0 ktSTW

10.0

SOG

WPT001

Speed over ground, speed through water

Estimated time of arrival at destination

Destination waypoint

Intended course

Own ship marker

0.9 nm

Shown (in red) when direction to steer is "left."

0.009nm

Direction to steer (green)

XTE monitor

0.9 nm

XTE range

Highway display

Soft keys

You can show the soft keys for the highway display by pressing the HIDE/SHOW key.

HIWAY CNTRL: On the radar/plotter/compass combination display you can switch control to the highway display by pressing the CNTRL soft key to show HIWAY. EDIT XT-LMT: Sets the range for XTE monitor scale. See the procedure on the previous

page for how to set. RESET XTE: This soft key may be operated to restart navigation, when a destination is set. Press the EDIT XT-LMT soft key followed by the RESET XTE soft key. See the previous page for details.

3-6

3. PLOTTER OPERATION

3.1.4 Nav data display

The nav data display provides comprehensive navigation data, and it is shown in a three-screen combination display. The user may select what data to display and where to display it. For details see the paragraph “7.8 Nav Data Display Setup.”

Appropriate sensors are required. Bars ( - -) appear when corresponding sensor is not connected.

Position

POSITION

34° 34. 5678' N

120° 34. 5678'

34° 14. 5678' N

120° 14. 5678'

10.0

9.2°

1324.1

Depth

Bearing to Waypoint

Speed through water

Waypoint Position

Water temperature

Nav data displays

SOGWPT POSITION

10.0

COURSESTW

101.6°

RANGEBEARING

0.18

TEMPDEPTH

18.2 °

Range to waypoint

Course

Speed over ground

3-7

3. PLOTTER OPERATION

3.2 Presentation Mode

Three types of presentation modes are provided for the plotter display: north-up, course-up and auto course-up. To change the presentation mode, press the HIDE/SHOW key followed by the MODE soft key. Each press of the key changes the presentation mode and presentation mode indication (top right-hand corner of the screen) cyclically in the sequence of North-up, Course-up and Auto course-up. For C-map model, the sequence is North-up, Perspective, Course-up and Auto course-up when PERSPECTIVE DISPLAY is set to ON, on the CHART DETAILS menu. (See Chapter

7.)

North-up

North (zero degree) is at the top of the display and own ship is shown with a filled circle. This mode is useful for long-range navigation.

Course-up

The course-up mode is useful for monitoring ship’s progress towards a waypoint. The destination is at the top of the screen when a destination is set. When no destination is set, the course or heading is at the top of the screen at the moment the course-up mode is selected. A filled triangle marks own ship’s position.

Note: The data sentences GGA and VTG must be output from the NavNet display unit connected to the GPS navigator in order to correctly orient the own ship marker in the course-up mode on other NavNet display units.

Auto course-up

The course is at the top of screen at the moment the auto course-up mode is selected. In this mode, the current course is kept at the top of the screen when the change is within 22.5 degrees. For example, if your vessel turns larger than

22.5 degrees to port or starboard, the chart display will rotate so that your course is pointing towards the top of the screen again. A filled triangle marks own ship’s position.

Perspective (C-map only)

Chart data is projected in perspective mode, for 3D

simulation, during navigation.

34° 22. 3456'N 359.9° 080° 22. 3456'E

16.0nm

WP-002

FISH

BRIDGE

TRIP

19.9 kt 99.9 nm

MARK

ENTRY

MODE

NTH UP

NAV

POS

D.BOX ON/ OFF

North-up

34° 22. 3456'N 359.9° M

080° 22. 3456'E

16.0nm

WPT 001

TRIP

19.9 kt 99.9 nm

MARK

ENTRY

MODE

CSE UP

CENTER

GO TO CURSOR

D. BOX ON/ OFF

Course-up

34° 22. 3456'N 359.9° M

080° 22. 3456'E

16.0 nm

TRIP

19.9 kt 99.9 nm

MARK

ENTRY

MODE

AT CU

CENTER

GOTO CURSOR

D. BOX ON/ OFF

3-8

Auto course-up

3. PLOTTER OPERATION

3.3 Shifting the Display

The plotter display can be shifted as below.

1. Use the Cursor pad to locate the cursor at a screen edge. The screen shifts in the direction opposite of cursor location.

2. To turn off the cursor, press the CENTER soft key. This also returns the own ship marker to the screen center.

3.4 Chart Scale

Chart scale (range) may be selected with the [RANGE -] or [RANGE +] key. The [-] key shrinks the chart range (image is expanded); the [+] key expands the cart range (image is shrunk). The available ranges are as below.

Charts scales

nm 0.125 0.25 0.5 1 2 4 8 16 32 64 128 256 512 1024 2048*

km 0.23 0.46 0.93 1.85 3.70 7.41 14.8 29.6 59.3 119 237 474 948 1896 3792 sm 0.144 0.29 0.58 1.15 2.30 4.60 9.21 18.4 36.8 73.7 147 295 589 1178 2356

*: 2046 or 2047 in high latitudes.

3.5 Chart Cards

3.5.1 Chart card overview

Your system reads NAVIONICS GOLD or C-MAP NT MAX charts, depending on the type of display unit you have.

When you insert a suitable chart card in the slot and own ship is near any cartographic object, a chart appears. If a wrong card is inserted or a wrong chart scale is selected, landmasses will appear hollow. Chart icons appear at the top of the display to help you select a suitable chart scale. The table below shows the chart icons and their meanings.

Icon Meaning

Proper card is not inserted or chart scale is too small. Press the ZOOM IN soft key to adjust chart scale.

Chart scale is too large. Operate the RANGE key to adjust chart scale.

Suitable chart scale is selected.

Chart icons and their meanings

3-9

3. PLOTTER OPERATION

3.5.2 Indices and chart enlargement

When the RANGE key is operated, you will see several frames appear on the chart. These frames are called indices and they show you what parts of the chart can be enlarged in the current range.

Sample chart (Japan), showing indices

When a chart cannot be displayed:

A chart will not be displayed in the following conditions:

• When the chart scale is too large or too small.

• When scrolling the chart outside the indices.

• When this happens, select proper chart scale.

Note: Indices can be turned on or off. For further details see “Chart border line” on page 7-15 for NAVIONICS charts and page 7-19 for C-MAP charts.

3-10

3. PLOTTER OPERATION

3.5.3 Navionics

charts

Data for aids to navigation

Selected Navionics charts can show buoy and lighthouse data. Simply place the cursor on the lighthouse or buoy mark.

Lighthouse Buoy

Place the cursor on a lighthouse or buoy mark.

Lighthous e mark

Port service icons

Selected Navionics GOLD charts show services available at ports, with icons.

1. Use the Cursor pad to place the cursor on the sailboat icon (denotes a port or harbor) desired.

2. Push the ENTER knob.

3. Roll the Cursor pad horizontally to select icon desired at the top of the display. The services available appear directly below the icon selected.

4. Press the RETURN soft key to finish.

Detailed information of service selected

List of services at the port selected

34° 22. 3456'N 359.9°M

080° 22. 3456'E

FIRST AID

16.0nm

19.9 kt 99.9 nm

Sailboat icon (Port)

TRIP

CANCEL

Emergency medical service

Water supply station

Customer service station

Port

Fueling station

Traveler's service station

Marine equipment service

Information center

Plotter di splay, showing port ser v ice display

3-11

3. PLOTTER OPERATION

Current (or tide) data

Some Navionics GOLD charts provide for calculation of the current (or tide) data for any date. Additionally it displays the time of sunrise and sunset, moon shape (on current data.)

1. Use the Cursor pad to place the cursor on a current icon (

2. Press the ENTER knob to show the current window.

3. Press the DATE soft key, and then enter the date desired.

4. Press the ENTER soft key.

34 24. 3456 N 359.9 NU

124 24. 3456 W 59.9kt 024nm

Time: 04:35 Speed (KT): 0.45ft Angle ( ): 142 21/08/02 +00

Max. Time Speed Aug. Slack

KT AT Flood 4:58 1.2 323 7:58 Ebb 23:15 1.2 323 20:15 Flood 17:15 1.1 145 15:15 Ebb 23:15 1.2 323 20:15

Moonphase: FULLY IN 1 DAY Sunrise: 05:03 Moonrise: 14:06 Sunset: 19:10 Moonset: 02:15

0.86

0.74

0.61

0.48

0.35 0481216 20 24

Current

DATE

RETURN

Current data display

Object information

You can see detailed information about a place selected by the cursor as below.

1. Use the Cursor pad to place the cursor on the location you desire to know more about.

2. Press the ENTER knob to show the OBJECT INFORMATION window.

34 24. 3456 N 359.9 NU

OBJECT INFORMATION

124 24. 3456 W 59.9kt 024nm

BLOCK AND TACKLE BOATYARD LAND AREA DERDGED AREA DEPTH AREA

ROCKS

POSITION 47 16.461'N 122 25.153'W BRG. & RNG. 191 T 0.549nm

VALUE OF SOUNDING

62.2m VERTICAL DATUM MEAN SEA LEVEL

MOVE TRACKBALL <-/->)

FIND

RETURN

Object information window

When there are two or more pages, roll the Cursor pad rightward to show the next page.

FIND function

When the OBJECT INFORMATION window is shown, objects can be listed according to their categories.

1. Press the FIND soft key with the OBJECT INFORMATION window shown.

3-12

3. PLOTTER OPERATION

34 24. 3456 N 359.9 NU

124 24. 3456 W 59.9kt 024nm

FIND ...

PORT LIST PORT SERVICE TIDE STATIONS CURRENT STATIONS OBSTRUCTION ROCKS

ENTER

CANCEL

FIND window

2. Operate the Cursor pad to choose the category to list, and then press the ENTER soft key or ENTER knob.

Note: You can show the selected object on the plotter display by pressing the SHOW soft key.

3-13

3. PLOTTER OPERATION

3.5.4 C-MAP charts

Cursor and data display

Besides its fundamental functions of providing position data, the cursor can also show information about caution area, depth area, source of data, etc. on C-MAP charts. In addition, you can display information about an icon by placing the cursor on it.

1. Move the Cursor pad to turn the cursor on.

2. Use the Cursor pad to place the cursor on the position desired.

3. Push the ENTER knob to open the Objects window.

Objects

Spot Sounding Depth area Exclusive economic zone Military practice area Restricted area Source of data

Objects window

4. Use the Cursor pad to select the item desired.

5. Push the ENTER knob to display details for object selected.

Depth area

Depth range value1

0.00 Meters

Depth range value2

1829.00 Meters

Example of caution area window

6. Press the CANCEL soft key to close the window.

7. Press the CANCEL soft key to finish.

Icon data

You may place the cursor on any icon to find information about the selected icon.

1. For example, place the cursor on a lighthouse icon.

3-14

3. PLOTTER OPERATION

Place the cursor on a lighthouse icon.

34° 22. 3456'N 359.9°M

080° 22. 3456'E

16.0nm

19.9 kt 99.9 nm

TRIP

MARK

ENTRY

MODE

NTH UP

CENTER

GO TO CURSOR

D. BOX ON /OFF

Lighthous e icon

2. Push the ENTER knob to show data. For example, the following window appears for a lighthouse.

Objects

Lighthouse

To we r

Light Underwater Rock Depth contour Depth contour Depth area Source of data

Object windows

3. Use the Cursor pad to select the item desired.

4. Push the ENTER knob to display detailed information.

Navigation mark, fixed Light.

Color white Height

7. 00 Meters Light characteristic occulting XXXXXXXX XXXXXXXX

Sample lighthouse dat a

5. If necessary, move the Cursor pad downward or upward to scroll the window.

6. Press the CANCEL soft key twice to finish.

3-15

3. PLOTTER OPERATION

V C

Tide information

The C-MAP NT chart card provides for calculation of the tide heights for any date. Additionally it displays the times of sunrise and sunset.

1. Use the Cursor pad to place the cursor on a Tide icon (

2. Push the ENTER knob to open the Objects window.

OBJECTS

Tide height

Cartographic area Source of data

Objects window

3. Use the Cursor pad to select Tide height.

4. Push the ENTER knob to open the TIDE window.

34 24. 3456 N 359.9 NU

Objects

Port area Port/Marine Fuel station Water Electricity Showers Pubric toilets Pubric telephone

ertical ursor

124 24. 3456 W 59.9kt 024nm

Time: 04:35L Height: 0.45ft Draught: 0.65ft 28/10/98 43° 32.860N 010° 18.022E

Port information

LIVORNO (LEGHORN)

High Water(max)

Low Water(min)

Sunrise

07:52L

Sunset

16:53 L

0.86

0.74

0.61

UTC

0.48

0.35 0481216 20 24

0.86ft(13:30 L)

0.35ft(21:00 L)

TIDE

DATE

RETURN

Tide window

5. Press the DATE soft key to open the DATE window.

6. Use the Cursor pad to position the cursor where

desired, then enter date with the ENTER knob. Repeat to enter complete date.

7. Push the ENTER knob to show the tidal graph for

(DAY. MONTH. YEAR)

2 8. 03. 2005

CHANGE DATE

entered date.

8. Use the Cursor pad to locate the vertical cursor on

the hour desired.

9. Use the Cursor pad to shift the horizontal cursor to

LIMIT: 31.12.2099

C-map, port service displa

select draught.

10. See the time, height and draught indications in left of the tide graph for tide information.

11. Press the CANCEL soft key twice to close the TIDE window.

3-16

Port service icons

3. PLOTTER OPERATION

Selected C-MAP shows services available at ports, with lists.

Objects

1. Use the Cursor pad to place the cursor on the sailboat

icon (denotes a port or harbor) desired.

2. Push the ENTER knob.

The services available appear.

3. Press the CANCEL soft key.

Note: When “Port/Marine” is selected, you can show a

Port area Port/Marine Fuel station Water Electricity Showers Public toilets Public telephone

picture of the port selected, provided such data is available on the chart card.

FIND function

When the Objects window is shown, objects can be listed according to their categories.

1. Press the FIND soft key with the Object window.

2. Operate the Cursor pad to choose the category to list, and then press the ENTER soft

key or ENTER knob. A list appears.

3. Press the CANCEL key twice to finish.

3-17

3. PLOTTER OPERATION

3.6 Working with Track

Your ship’s track is plotted on the screen using navigation data fed from position-fixing equipment. This section shows you what you can do with track, from turning it on or off to changing its plotting interval. In the default setting, own ship’s track is turned on and is displayed in red.

3.6.1 Displaying track

Own ship track

1. Press the MENU key followed by the CHART SETUP and TRACKS & MARKS CONTROL soft keys to open the TRACK CONTROL menu.

OWN SHIP TRACK DISP

OWN SHIP TRACK COLOR

RED

TARGET TRACK DISPLAY

OFF

TARGET TRACK COLOR

WHITE

INTERVAL

TIME

TIME INTERVAL

00m10s

DISTANCE INTERVAL

00.10nm

MEMORY(TRACK & MARK)

2000POINTS (MARK MEMORY) (6000)POINTS

SHIP’S TRACK STATUS

TRACKING

TRACK: 1234/2000 MARK : 9/6000

TRACK CONTROL

EDIT

TRACK

RESUME

ERASE T & M

MARK SETUP

RETURN

Track control menu

2. Use the Cursor pad to select OWN SHIP TRACK DISP.

3. Press the EDIT soft key to show the track display window.

4. Use the Cursor pad to select ON (default setting) or OFF as appropriate.

5. Press the ENTER soft key.

6. Press the MENU key to close the menu.

Note: The number of track and mark points used appears at the SHIP’S TRACK STATUS window on the TRACK CONTROL menu. Using the figure above as an example, 1234 points of track and 9 marks have been recorded.

Target track

Target track, NMEA format TTM (Tracked Target Message) data sentence, may be turned on or off as desired. The default setting is ON.

1. Press the MENU key followed by the CHART SETUP and TRACKS & MARKS

CONTROL soft keys to open the TRACK CONTROL menu.

2. Use the Cursor pad to select TARGET TRACK DISPLAY.

3. Press the EDIT soft key to show the target track display window.

3-18

3. PLOTTER OPERATION

4. Use the Cursor pad to select one of the following:

ON or OFF (no ARP or AIS): Turn on or off target tracks ARP ONLY (ARP equipped): Show only ARP tracks. AIS ONLY (AIS equipped): Show only AIS tracks. BOTH: Show both ARP and AIS tracks.

5. Press the ENTER soft key.

6. Press the MENU key to close the menu.

3.6.2 Stopping, restarting plotting of own ship track

When your boat is at anchor or returning to port you probably won’t need to record its track. You can stop recording the track, to conserve the track memory, as follows:

1. Press the MENU key followed by the CHART SETUP and TRACKS & MARKS

CONTROL soft keys to open the TRACK CONTROL menu.

▲

OWN SHIP TRACK DISP

OWN SHIP TRACK COLOR

TARGET TRACK DISPLAY

TARGET TRACK COLOR

INTERVAL

TIME INTERVAL

DISTANCE INTERVAL

MEMORY(TRACK & MARK)

(MARK MEMORY) (6000)POINTS

SHIP’S TRACK STATUS

TRACKING

TRACK: 1234/2000 MARK : 9/6000

RED

OFF

WHITE

TIME

00m10s

00.10nm

2000POINTS

Track is plotted

TRACK CONTROL

EDIT

TRACK

RESUME

ERASE T & M

MARK SETUP

RETURN

RESUME

TRACK

HALT

Track control menu

▲

OWN SHIP TRACK DISP

OWN SHIP TRACK COLOR

TARGET TRACK DISPLAY

TARGET TRACK COLOR

INTERVAL

TIME INTERVAL

DISTANCE INTERVAL

MEMORY(TRACK & MARK)

(MARK MEMORY) (6000)POINTS

SHIP’S TRACK STATUS

NOT TRACKING

TRACK: 1234/2000 MARK : 9/6000

RED

OFF

WHITE

TIME

00m10s

00.10nm

2000POINTS

Track not plotted

TRACK CONTROL

EDIT

TRACK

HALT

ERASE T & M

MARK SETUP

RETURN

2. Press the TRACK RESUME soft key. The soft key now shows “TRACK HALT” and the indication “TRACKING” in the SHIP’S TRACK STATUS window changes to “NOT TRACKING.” In addition, the icon “H” is displayed at the top of the plotter display and own ship marker becomes a hollow circle. To restart plotting the track, press the TRACK HALT soft key

3. Press the MENU key to close the menu.

3.6.3 Changing track color

Track can be displayed in red (default setting), yellow, green, light-blue, purple, blue and white. It can be useful to change track color on a regular basis to discriminate between previous day’s track, etc.

3-19

3. PLOTTER OPERATION

Own ship’s track

1. Press the MENU key followed by the CHART SETUP and TRACKS & MARKS

CONTROL soft keys to open the TRACK CONTROL menu.

2. Use the Cursor pad to select OWN SHIP TRACK COLOR.

3. Press the EDIT soft key to display the track color window.

TRACK COLOR

▲

RED

YELLOW

GREEN

LIGHT BLUE

PURPLE

BLUE

WHITE

▼

Own ship track color window

4. Use the Cursor pad to select the color desired.

5. Press the ENTER soft key.

6. Press the MENU key to close the menu.

Target track

Like own ship’s track, target tracks can be displayed in red, yellow, green, light-blue, purple, blue and white (default setting).

1. Press the MENU key followed by the CHART SETUP and TRACKS & MARKS

CONTROL soft keys to open the TRACK CONTROL menu.

2. Use the Cursor pad to select TARGET TRACK COLOR.

3. Press the EDIT soft key to display the track color window.

4. Use the Cursor pad to select the color desired.

5. Press the ENTER soft key.

6. Press the MENU key to close the menu.

3.6.4 Track plotting method and interval for own ship track

In drawing the own ship track, first the ship’s position fed from position-fixing equipment is stored into the unit’s memory at an interval of time or distance. A shorter interval provides for better reconstruction of the track, but the storage time of the track is reduced. When the track memory becomes full, the oldest track is erased to make room for the latest.

Track plotting method

Track may be plotted by time or distance. The default setting is “time.”

1. Press the MENU key followed by the CHART SETUP and TRACKS & MARKS

CONTROL soft keys to open the TRACK CONTROL menu.

2. Use the Cursor pad to select INTERVAL.

3. Press the EDIT soft key to display the plot window.

3-20

3. PLOTTER OPERATION

INTERVAL

▲

TIME

DISTANCE

▼

Interval window

4. Use the Cursor pad to select TIME or DISTANCE as appropriate. Distance is useful for conserving track memory, since no track is recorded when the boat is stationary.

5. Press the ENTER soft key.

6. Press the MENU key to close the menu.

Track plotting interval

1. Press the MENU key followed by the CHART SETUP and TRACKS & MARKS CONTROL soft keys to open the TRACK CONTROL menu.

2. Use the Cursor pad to select TIME INTERVAL or DISTANCE INTERVAL as appropriate.

3. Press the EDIT soft key to display the time or distance interval window, depending on what you selected at step 2.

TIME INTERVAL

Setting range: 0 min 1 sec (continuous) - 99 min 59 sec Default setting: 10 sec

00m10s

(When selecting TIME INTERVAL.)

DISTANCE INTERVAL

Setting range: 0.00 nm (continuous) - 99.99 nm (km, sm) Default setting: 0.1 nm

00.10nm

(When selecting DISTANCE INTERVAL.)

Interval windows

4. Use the Cursor pad to select digit and enter value with the ENTER knob. The CLEAR soft key functions to clear an entire line of data.

5. Push the ENTER knob or ENTER soft key.

6. Press the MENU key to close the menu.

3.6.5 Changing own ship track/mark distribution setting

The equipment stores a total of 8000 points of track and marks. This amount may be distributed as desired, and the default setting is 2000 points of track and 6000 points for marks.

When you change the track memory setting, all tracks and marks in the memory are erased. If necessary save the data to a memory card. For further details see the paragraph “6.1.2 Saving data to a memory card.”

1. Press the MENU key followed by the CHART SETUP and TRACKS & MARKS CONTROL soft keys to open the TRACK CONTROL menu.

2. Use the Cursor pad to select MEMORY (TRACK & MARK).

3-21

3. PLOTTER OPERATION

3. Press the EDIT soft key to display the track memory window.

TRACK MEMORY

2000/8000 POINTS

Track memory window

4. Use the Cursor pad to select digit and use the ENTER knob to enter value.

5. Push the ENTER soft key or the ENTER knob. You are asked if you are sure to change

the track memory capacity.

6. Push the ENTER knob.

7. Press the MENU key to close the menu.

3.6.6 Erasing track

This paragraph shows you how to erase own ship’s track and target tracks. You can erase ship’s track three ways: collectively, by color and by area.

Erasing own ship track by area

You can erase own ship’s track by area as below. This feature is not available when the overlay mode is in use.

1. Press the MENU key followed by the CHART SETUP, TRACKS & MARKS CONTROL

and ERASE T & M soft keys to show the ERASE menu.

ERASE ALL TRACKS

ERASE TRACKS BY AREA

ERASE TRACKS BY COLOR

ERASE TARGET TRACKS

ERASE ALL MARKS/LINES

ERASE MARKS BY AREA

SHIP’S TRACK STATUS

TRACKING

TRACK: 1234/2000 MARK : 9/6000

ERASE

EDIT

RETURN

Erase menu

2. Use the Cursor pad to select ERASE TRACKS BY AREA, then press the EDIT soft key.

The menu is erased and the plotter display appears.

3. Use the Cursor pad to place the cursor at the top left-hand corner of the area which you

want to ease track from.

4. Press the START soft key or the ENTER knob.

3-22

3. PLOTTER OPERATION

5. Move the cursor to the bottom right-hand corner of the area which you want to ease track from.

6. Press the END soft key or the ENTER knob. You are asked if you are sure to delete the track.

7. Push the ENTER knob to delete the track selected.

8. Press the MENU key twice to close the menu.

Erasing own ship track by color

You may erase own ship’s track by color as follows:

1. Press the MENU key followed by the CHART SETUP, TRACKS & MARKS CONTROL and ERASE T & M soft keys to show the ERASE menu.

2. Use the Cursor pad to select ERASE TRACKS BY COLOR, then press the EDIT soft key.

ERASE TRK BY COLOR

▲

RED

YELLOW

GREEN

LIGHT BLUE

PURPLE

BLUE

WHITE

▼

Erase track by color window

3. Use the Cursor pad to select the color you want to erase, then push the ENTER knob.

4. Push the ENTER knob to erase the track color selected.

Press the MENU key twice to close the menu.

Erasing all own ship track

1. Press the MENU key followed by the CHART SETUP, TRACKS & MARKS CONTROL and ERASE T & M soft keys to show the ERASE menu.

2. Use the Cursor pad to select ERASE ALL TRACKS, then press the EDIT soft key.

3. Push the ENTER knob to erase all own ship track.

Press the MENU key twice to close the menu.

Erasing all target tracks

1. Press the MENU key followed by the CHART SETUP, TRACKS & MARKS CONTROL and ERASE T & M soft keys to show the ERASE menu.

2. Use the Cursor pad to select ERASE TARGET TRACKS, then press the EDIT soft key.

3. Push the ENTER knob to erase all target tracks.

4. Press the MENU key twice to close the menu.

3-23

3. PLOTTER OPERATION

3.7 Marks, Lines

Marks are useful for denoting important points such as a good fishing spot. Marks can be inscribed in seven shapes and seven colors: Red, yellow, green, light-blue, purple, blue and white.

{

3.7.1 Entering a mark, line

1. Place the cursor where you want a mark to appear.

2. Press the SHOW/HIDE key (if necessary) followed by the MARK ENTRY soft key.

The mark is inscribed in the size, color and shape selected on the mark & line menu. The default mark attributes are size, large; color, yellow, and shape, hollow circle (

○

Note: This function can be changed to entering the quick point. For detail, see page 7-10.

3.7.2 Changing mark attributes

You can select the shape, size and color for marks on the MARKS & LINES menu.

1. Press the MENU key to show the menu.

2. Press the CHART SETUP, TRACKS & MARKS CONTROL and MARK SETUP soft keys to show the MARKS & LINES menu.

MARKS &

MARKS/LINES COLOR

YELLOW

MARKS SHAPE

{

LINES STYLE

LINES

EDIT

MARKS SIZE

LARGE

SHIP’S TRACK STATUS

TRACKING

TRACK: 1234/2000 MARK : 9/6000

RETURN

Marks & lines menu

3. Select MARKS/LINES COLOR, then press the EDIT soft key.

4. Use the Cursor pad to choose color desired (default setting: yellow).

5. Press the ENTER soft key.

6. Select MARKS SHAPE, then press the EDIT soft key.

3-24

3. PLOTTER OPERATION

MARKS SHAPE

▲

¡ ¡ ¡

¡ ¡ ¡ ¡

▼

Marks shape window

7. Use the Cursor pad to select mark shape desired, then press the ENTER soft key.

8. Select MARKS SIZE, then press the EDIT soft key.

9. Use the Cursor pad to select LARGE (default setting) or SMALL as appropriate.

10. Press the ENTER soft key.

11. Press the MENU key twice to close the menu.

3.7.3 Selecting line type

You may inscribe lines to denote good fishing spots, areas of special interest, etc. You can even construct simple charts.

1. Press the MENU key followed by the CHART SETUP, TRACKS & MARKS CONTROL

and MARK SETUP soft keys to show the MARKS & LINES menu.

MARKS/LINES COLOR

YELLOW

MARKS SHAPE

LINES STYLE

MARKS SIZE

LARGE

SHIP’S TRACK STATUS

TRACKING

TRACK: 1234/2000 MARK : 9/6000

Marks & lines menu

2. Select LINES STYLE, then press the EDIT soft key.

LINES STYLE

▲

----

¡ ¡

▼

MARKS & LINES

EDIT

RETURN

Lines style window

3-25

3. PLOTTER OPERATION

3. Use the Cursor pad to select line style desired, then press the ENTER soft key. The

line style “dot” disables line drawing. Edge of lines is determined by mark shape. For example, selecting the circle shape will join lines with a circle.

4. Press the MENU key twice to close the menu.

3.7.4 Erasing marks, lines

Erasing an individual mark

1. Operate the Cursor pad to place the cursor on the mark you want to erase.

2. Press the CLEAR key to erase the mark.

Erasing an individual line

Place the cursor on an end of the line to erase, then press the CLEAR key. Placing the cursor at the intersecting point of two line segments will erase both line segments.

Erasing marks, lines by area

This feature is not available when the overlay mode is in use.

1. Press the MENU key followed by the CHART SETUP, TRACKS & MARKS CONTROL

and ERASE T & M soft keys to show the ERASE menu.

2. Use the Cursor pad to select ERASE MARKS BY AREA, then press the EDIT soft key.

The menu is erased and the plotter display appears.

3. Use the Cursor pad to place the cursor at the top left-hand corner of the area which you

want to erase marks and lines from.

4. Press the START soft key or the ENTER knob.

5. Move the cursor to the bottom right-hand corner of the area which you want to erase marks and lines from.

6. Press the END soft key or the ENTER knob. You are asked if you are sure to delete the marks/lines selected. Press the ENTER knob to delete.

7. Press the MENU key twice to close the menu.

Erasing all marks, lines

You can erase all marks and lines collectively. Be absolutely sure you want to erase all marks and lines - erased marks and lines cannot be restored.

1. Press the MENU key followed by the CHART SETUP, TRACKS & MARKS CONTROL and ERASE T & M soft keys to show the ERASE menu.

2. Use the Cursor pad to select ERASE ALL MARKS/LINES, then press the EDIT soft key.

3. Push the ENTER knob to erase all marks and lines.

4. Press the MENU key twice to close the menu.

3-26

3. PLOTTER OPERATION

3.8 Waypoints

In navigation terminology, a waypoint is a particular location on a voyage whether it be a starting, intermediate or destination point. A waypoint is the simplest piece of information your equipment requires to get you to a destination, in the shortest distance possible.

This unit has 999 waypoints into which you can enter position information. You may enter a waypoint five ways: at own ship position, at MOB position (see page 1-13 for details), by cursor, by range and bearing, and through the waypoint list (manual input of latitude and longitude).

3.8.1 Entering waypoints

Entering a waypoint at own ship position

Press the SAVE/MOB key momentarily to store your position as a waypoint. This new waypoint is saved to the waypoint list, under the youngest empty waypoint number.

Entering a waypoint with the cursor

1. Press the MENU key to open the menu.

2. Press the WAYPOINTS/ROUTES, WAYPOINTS and WAYPOINT BY CURSOR soft keys. The plotter display appears.

3. Operate the Cursor pad to place the cursor where you want to enter a waypoint.

4. Press the NEW WPT soft key. The waypoint window appears and it shows waypoint mark shape, waypoint name, comment (default: time and date), position of waypoint and proximity alarm radius.

NEW

MARK

▲

NAME

0 01WPT

34°44.000'N 135°21.000'W

COMMENT

02:36 01JAN01

POSITION

LAT 34° 12. 134'N LON 134° 12. 345'W

PROXIMITY ALARM RADIUS

002WPT

00:00 01JAN00

34°44.000'N 135°21.000'W

003WPT

00:00 01JAN00

34°44.000'N 135°21.000'W

359.9°

0.00nm

359.9°

0.00nm

359.9°

0.00nm

0. 00nm

WPT

SELECT MARK

COORD TYPE

N < - -> S E < - -> W

SAVE

RETURN

Waypoint window

5. If you do not need to change the waypoint data, press the SAVE soft key to register the waypoint. The steps which follow show you how to change waypoint data.

6. Press the SELECT MARK soft key.

7. Press the MARK SHAPE soft key to open the mark shape selection window.

3-27

3. PLOTTER OPERATION

SELECT MARK

Waypoint mark shape selection window

8. Operate the Cursor pad to select shape desired.

9. Press the ENTER soft key.

10. Press the SELECT MARK and MARK COLOR soft keys in that order to open the waypoint mark color selection window. Select the color desired, then press the ENTER soft key.

SELECT COLOR

▲

RED

YELLOW

GREEN

LIGHT BLUE

PURPLE

BLUE

WHITE

▼

Waypoint mark color selection window

Note: You cannot change the shape and color of a waypoint when the proximity alarm radius for it is other than “zero.” To change shape or color, enter all zeroes as the proximity alarm radius.

11. You can change the name (6 characters), comment (13 characters), L/L position and the proximity alarm radius for a waypoint as follows:

Use the Cursor pad to select the NAME, COMMENT, position box or PROXIMITY ALARM

RADIUS field. (“Proximity alarm radius” provides for audio and visual alarms when your boat nears a waypoint by the distance specified. The proximity alarm must be turned on in the ALARM menu to use this feature. For details see the paragraph 3.11.6.)

Use the Cursor pad to select location. Enter appropriate alphanumeric character with the ENTER knob.

12. Press the SAVE soft key to register the waypoint.

13. Enter another waypoint, or press the MENU key to close the menu.

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3. PLOTTER OPERATION

Entering a waypoint by range and bearing

This method is useful when you want to enter a waypoint using range and bearing to a target found on a radar.

1. Press the MENU key to open the menu.

2. Press the WAYPOINTS/ROUTES, WAYPOINTS and WAYPOINT BY RNG & BRG soft keys.

3. A red “X” appears at own ship position, and it is the origin point for range and bearing. Operate the Cursor pad to place the cursor on the location desired. Range and bearing from own ship to the cursor appear at the top of the display.

Note: The origin point of range and bearing can be shifted to the location desired. Operate the Cursor pad to select location, then press the START POINT soft key.

4. Press the NEW WPT soft key. The waypoint window appears and it shows mark shape, waypoint name, comment (default: date and time), position of waypoint and proximity alarm radius.

NEW

MARK

▲

NAME

0 01WPT

34°44.000'N 135°21.000'W

COMMENT

02:36 01JAN01

POSITION

LAT 34° 12. 134'N LON 134° 12. 345'W

002WPT

00:00 01JAN00

34°44.000'N 135°21.000'W

003WPT

00:00 01JAN00

34°44.000'N 135°21.000'W

359.9°

0.00nm

359.9°

0.00nm

359.9°

0.00nm

WPT

SELECT MARK

COORD TYPE

N < - -> S E < - -> W

SAVE

RETURN

PROXIMITY ALARM RADIUS

0. 00nm

Waypoint window

5. If necessary, change waypoint data following the instructions from step 6 through 11 in “Entering a waypoint with the cursor” on page 3-28.

6. Press the SAVE soft key to register the waypoint.

7. Enter another waypoint as above, or press the MENU key to finish.

Entering a waypoint from the waypoint list

You can manually enter waypoint position from the waypoint list as follows:

1. Press the MENU key to open the menu.

2. Press the WAYPOINTS/ROUTES and WAYPOINTS soft keys.

3. Press the LOCAL LIST (lists waypoints in order from nearest to furthest, maximum 32 points) or ALPHANUMERIC LIST (lists waypoints in ALPHANUMERIC order) soft key.

3-29

Furuno GD-1720C User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SAFETY INSTRUCTIONS

TABLE OF CONTENTS

FOREWORD

SYSTEM CONFIGURATIONS

1. OPERATIONAL OVERVIEW

1.1 Operating Controls

1.2 Inserting a Chart Card

1.3 Turning the Unit On/Off

1.4 Display Brilliance, Panel Brilliance, Hue

1.5 Selecting a Display

1.6 Cursor pad, Cursor

1.8 Data Boxes

1.9 Function Keys

1.10 Simulation Display

2. RADAR OPERATION

2.1 Radar Display

2.2 Transmitting, Stand-by

2.3 Tuning

2.4 Adjusting the Gain

2.5 Reducing Sea Clutter

2.6 Reducing Precipitation Clutter

2.7 Range Scale

2.8 Pulselength

2.9 Presentation Mode

2.10 Measuring the Range

2.11 Measuring the Bearing

2.12 Erasing the Heading Line, North Marker

2.13 Reducing Noise Interference

2.14 Rejecting Radar Interference

2.15 Zoom

2.16 Shifting the Picture

2.17 Using the Offset EBL

2.18 Echo Trails

2.19 Echo Stretch

2.20 Echo Averaging

2.21 Outputting TLL Data

2.22 Guard Alarm

2.23 Watchman

2.24 Waypoint Marker

2.25 ARP, TTM Operation

2.26 Interpreting the Radar Display

3. PLOTTER OPERATION

3.1 Plotter Displays

3.2 Presentation Mode

3.3 Shifting the Display

3.4 Chart Scale

3.5 Chart Cards

3.6 Working with Track

3.7 Marks, Lines

3.8 Waypoints