Humminbird 346c DI Operation Manual
346c DI
346c DI
Operations Manual
Operations Manual
531955-2EN_A
Thank You!
Thank you for choosing Humminbird®, the #1 name in fishfinders.
Humminbird® has built its reputation by designing and manufacturing
top-quality, thoroughly reliable marine equipment. Your Humminbird® is
designed for trouble-free use in even the harshest marine environment. In
the unlikely event that your Humminbird® does require repairs, we offer an
exclusive Service Policy - free of charge during the first year after purchase,
and available at a reasonable rate after the one-year period. For complete
details, see the separate warranty card included with your unit. We
encourage you to read this operations manual carefully in order to get full
benefit from all the features and applications of your Humminbird® product.
To contact our Customer Resource Center, call 1-800-633-1468 or visit our
Web site at humminbird.com.
WARNING! This device should not be used as a navigational aid to prevent collision,
grounding, boat damage, or personal injury. When the boat is moving, water depth
may change tooquickly to allowtime for you to react. Always operate the boat at very
slow speeds if you suspect shallow water or submerged objects.
WARNING! Disassembly and repair of this electronic unit should only be performed
by authorized service personnel. Any modification of the serial number or attempt to
repair the original equipment or accessories by unauthorized individuals will void the
warranty.
WARNING! This product contains chemicals known to the State of California to cause
cancer and/or reproductive harm.
WARNING! Do not travel at high speedwith the unit cover installed. Remove the unit
cover before traveling at speeds above 20 mph.
NOTE: Some features discussed in this manual require a separate purchase, and
some features are only available on international models. Every effort has been
made to clearly identify those features. Please read the manual carefully in order
to understand the full capabilities of your model.
ROHS STATEMENT: Product designed and intended as a fixed installation or part of
a system in a vessel may be considered beyond the scope of Directive 2002/95/EC of
the European Parliament and of the Council of 27 January 2003 on the restriction of
the use of certain hazardous substances in electrical and electronic equipment.
ATTENTION INTERNATIONAL CUSTOMERS: Products sold in the U.S. arenot
intended for use in the international market. Humminbird® international units
provide international features and are designed to meet country and regional
regulations. Languages, maps, time zones, units of measurement, and
warranty are examples of features that are customized for Humminbird®
international units purchased through our authorized international distributors.
Toobtain a list of authorized international distributors, please visit our Web site
at humminbird.com or contact our Customer Resource Center at
(334) 687-6613.
NOTE: To purchase accessories for your control head, visit our Web site at
humminbird.com or contact our Customer Resource Center at 1-800-633-1468.
NOTE: The illustrations in this manual may not look exactly like the display on your
Humminbird® model, but your model will work in the same way.
NOTE: The procedures and features described in this manual are subject to change
without notice. This manual was written in English and may have been translated to
another language. Humminbird® is not responsible for incorrect translations or
discrepancies between documents.
300 Series™, Down Imaging™, Fish ID+™, Humminbird®, RTS™, RTS Window™, Structure ID®,
SwitchFire™, WhiteLine™, and X-Press™ Menu are trademarked by or registered trademarks of
Johnson Outdoors Marine Electronics, Inc.
Baekmuk Batang, Baekmuk Dotum, Baekmuk Gulim, and Baekmuk Headline are registered
trademarks owned by Kim Jeong-Hwan.
© 2012 Johnson Outdoors Marine Electronics, Inc. All rights reserved.
Table of Contents
Power On 1
How Sonar Works 2
Down Imaging™ Sonar............................................................................................ 4
Dual Beam Ice Transducer
What’s on the 300 Series™ Control Head 6
Key Functions 7
POWER/LIGHT Key .................................................................................................. 7
VIEW Key ................................................................................................................ 8
MENU Key ................................................................................................................ 8
4-WAY Cursor Control Key ...................................................................................... 8
EXIT Key .................................................................................................................... 9
What’s on the Sonar Display 10
Understanding the Sonar Display.......................................................................... 12
Real Time Sonar (RTS™) Window ........................................................................ 12
Sonar Colors and Bottom View.............................................................................. 13
SwitchFire™............................................................................................................ 15
Freeze Frame and Active Cursor............................................................................ 15
Instant Image Update ............................................................................................ 15
(optional-purchase XI 9 20 Ice Transducer only) .................. 5
What’s on the Down Imaging™ Display 16
Understanding the Down Imaging™ Display ...................................................... 18
Interpreting the Display.......................................................................................... 18
Down Imaging™ Sensitivity .................................................................................. 19
Freeze Frame and Active Cursor............................................................................ 19
Views 20
Sonar View.............................................................................................................. 22
Sonar Zoom View .................................................................................................. 23
Split Sonar View .................................................................................................... 24
i
Table of Contents
Big Digits View ...................................................................................................... 25
Down Imaging™ View .......................................................................................... 26
Circular Flasher View.............................................................................................. 27
Down Imaging™/Sonar Combo View .................................................................... 32
The Menu System 33
Start-Up Options Menu 34
Normal .................................................................................................................... 34
Simulator ................................................................................................................ 35
System Status ........................................................................................................ 35
Self Test .................................................................................................................. 36
Accessory Test ........................................................................................................ 36
X-Press™ Menu 37
Main Menu 38
Quick Tips for the Main Menu
Note for all Menu Settings .......................................................................................... 39
User Mode (Normal or Advanced)................................................................................ 40
.................................................................................. 39
Sonar X-Press™ Menu
Sensitivity .............................................................................................................. 43
Upper Range
(Advanced: Sonar, Split Sonar, Circular Flasher, and Big Digits Views only) ................ 44
Lower Range .......................................................................................................... 44
Chart Speed .......................................................................................................... 45
Zoom Level
Bottom Lock
Bottom Range
(Sonar Zoom View only) ............................................................................45
(Sonar Zoom View only).......................................................................... 45
(Sonar Zoom View only when Bottom Lock is On) .................................. 46
Down Imaging™ X-Press™ Menu
Down Sensitivity .................................................................................................... 48
DI Enhance.............................................................................................................. 49
(Sonar Views only)
(Down Imaging™ Views only)
ii
42
47
Table of Contents
Upper Range (Advanced).......................................................................................... 50
Lower Range .......................................................................................................... 50
Chart Speed ............................................................................................................ 51
DI Colors.................................................................................................................. 51
Flasher X-Press™ Menu
Sensitivity .............................................................................................................. 53
Upper Range
(Advanced: Sonar, Split Sonar, Circular Flasher, and Big Digits Views only) ................ 53
Lower Range .......................................................................................................... 54
Color Palette
Zoom Level
(Circular Flasher, Ice Fishing Mode only) ................................................ 54
(Circular Flasher View, Ice Fishing Mode only)............................................ 55
(Circular Flasher View only)
52
Alarms Menu Tab 56
Depth Alarm............................................................................................................ 57
Fish ID Alarm .......................................................................................................... 57
Low Battery Alarm.................................................................................................. 57
Temp. Alarm............................................................................................................ 58
Alarm Tone.............................................................................................................. 58
Timer Setup ............................................................................................................ 59
Start Timer .............................................................................................................. 59
Stop Timer
(with the Timer running) .......................................................................... 59
Sonar Menu Tab 60
Beam Select............................................................................................................ 61
Imaging Frequency
Surface Clutter ...................................................................................................... 63
SwitchFire™ .......................................................................................................... 63
Fish ID+™ .............................................................................................................. 64
Fish ID Sensitivity .................................................................................................. 65
Real Time Sonar (RTS™) Window ........................................................................ 65
Sonar Colors
(Down Imaging™ Views only) .................................................... 62
(Sonar View, Sonar Zoom View, and Big Digits View)................................ 66
iii
Table of Contents
Bottom View .......................................................................................................... 66
Zoom Width ............................................................................................................ 67
455 kHz Sensitivity
Depth Lines
Noise Filter
Max Depth
Water Type
Digital Depth Source
with optional-purchase transducers only)
DI Pings
(Advanced, Down Imaging™ models with
optional-purchase transducers only)
Ice Fishing Mode
DI Colors
(Down Imaging™ Views only)...................................................................... 71
Setup Menu Tab 72
Units - Depth .......................................................................................................... 73
Units - Temp
Units - Distance
Units - Speed
User Mode ............................................................................................................ 73
Language
Triplog Reset
Restore Defaults .................................................................................................... 74
Select Views
Select Readouts
Depth Offset
Temp. Offset
Digits Format
Speed Calibration
Demonstration........................................................................................................ 77
Sound Control ........................................................................................................ 77
(International only) .................................................................................... 74
(Advanced) ................................................................................ 67
(Advanced)............................................................................................ 67
(Advanced) ............................................................................................ 68
(Advanced) ............................................................................................ 68
(Advanced) ............................................................................................ 68
(Advanced, Down Imaging™ models
.................................................................. 69
.......................................................................... 70
(Advanced) .................................................................................. 71
(International only)................................................................................ 73
(with Temp/Speed only) .................................................................. 73
(with Temp/Speed only) ...................................................................... 73
(with Temp/Speed only) ...................................................................... 74
(Advanced) .......................................................................................... 74
(Advanced, Sonar View and Down Imaging™ View only) .................... 75
(Advanced) .......................................................................................... 76
(Advanced) .......................................................................................... 76
(Advanced) ..........................................................................................76
(Advanced, with Temp/Speed only)................................................ 77
iv
Table of Contents
Maintenance 78
Control Head Maintenance.................................................................................... 78
Transducer Maintenance ...................................................................................... 79
Troubleshooting 80
Fishfinder Doesn’t Power Up ................................................................................ 80
Fishfinder Defaults to Simulator with a Transducer Attached ............................ 80
Display Problems.................................................................................................... 81
Finding the Cause of Noise.................................................................................... 82
Specifications 83
Glossary 85
Contact Humminbird® 89
NOTE: Entries in this Table of Contents which list (International only) are
only available on products sold outside of the U.S. by our authorized
international distributors. To obtain a list of authorized international
distributors, please visit our Web site at humminbird.com or contact our
Customer Resource Center at (334) 687-6613.
NOTE: Entries in this Table of Contents which list (with Temp/Speed only)
require the purchase of separate accessories. You can visit our Web site at
humminbird.com to order these accessories online or contact our Customer
Resource Center at 1-800-633-1468.
v
Power On
Follow the instructions below to power on your Humminbird® control head.
346c DI Title Screen
1. Press the POWER/LIGHT key.
2. When the Title screen is displayed, press the MENU key to access the
Start-Up Options Menu.
3. Use the 4-WAY Cursor Control key to select Normal (if there is a
transducer attached to the control head), or Simulator (if there isn’t a
transducer attached to the control head).
NOTE: See Start-Up Options Menu for more information.
• If a functioning transducer is connected, Normal operation will be
selected automatically at power up, and your Fishfinder can be
used on the water.
• If a transducer is not connected and you wait too long to select a
Start-Up Option, the system will default to whichever menu is
already highlighted.
• In Simulator you can learn how to use your control head and save
settings in advance for later use.
1
Power On
How Sonar Works
Sonar technology is based on sound waves. The 300 Series™ Fishfinder uses
sonar to locate and define structure, bottom contour and composition, as well
as depth directly below the transducer.
Your 300 Series™ Fishfinder sends a sound wave signal and determines
distance by measuring the time between the transmission of the sound wave
and when the sound wave is reflected off of an object; it then uses the reflected
signal to interpret location, size, and composition of an object.
Sonar is very fast. A sound wave can travel from the surface to a depth of
240 ft (70 m) and back again in less than 1/4 of a second. It is unlikely that your
boat can “outrun“ this sonar signal.
SONAR is an acronym for SOund and
NAvigation Ranging. Sonar uses precision
sound pulses or “pings“ which are emitted
into the water in a teardrop-shaped beam.
The sound pulses “echo“ back from objects
in the water such as the bottom, fish, and
other submerged objects. The returned
echoes are displayed on the LCD screen.
Each time a new echo is received, the old
echoes are moved across the LCD, creating
a scrolling effect.
How Sonar Works
2
When all the echoes are viewed side by side, an
easy to interpret “graph“ of the bottom, fish, and
structure appears.
The sound pulses are transmitted at various
frequencies depending on the application. Very
high frequencies (455 kHz) are used for greatest
definition but the operating depth is limited. High
frequencies (200 kHz) are commonly used on
consumer sonar and provide a good balance
between depth performance and resolution. Low
frequencies (83 kHz) are typically used to achieve
greater depth capability.
The power output is the amount of energy
generated by the sonar transmitter. It is commonly
measured using two methods:
• Root Mean Square (RMS) measures power
output over the entire transmit cycle.
• Peak to Peak measures power output at the
highest points.
The benefits of increased power output are the
ability to detect smaller targets at greater
distances, ability to overcome noise, better high
speed performance and enhanced depth capability.
3
How Sonar Works
Down Imaging™ Sonar
75 Degree Total Coverage
16°
75°
25°
455kHz
200kHz
455kHz
45°
800kHz
Your 346c DI Fishfinder uses Down
Imaging™ technology. The Down Imaging™
transducer scans the water with razor-thin,
high-definition beams. The beams are wide
(side to side) but very thin front to back.
The Down Imaging™ beams can be operated
at two frequencies: 455 kHz (75°) or 800 kHz
(45°). Select 455 kHz for the best overall
image quality and depth. Select 800 kHz for
the sharpest image. See Sonar Menu Tab:
Imaging Frequency for more information.
The transducer also uses conical beams to
provide data in traditional 2D format (see
What’s on the Sonar Display). Select
455 kHz for a narrowly focused 16° center
beam, or select 200 kHz for a wider 25° beam
(see Sonar Menu Tab: Beam Select).
Depth capability is affected by such factors
as boat speed, wave action, bottom hardness,
water conditions, and transducer installation.
How Sonar Works
4
Ice transducer
Dual Beam Ice Transducer
(optional-purchase XI 9 20 Ice Transducer only)
Your Fishfinder supports the optionalpurchase XI 9 20 Ice Transducer which
provides selectable dual-frequency sonar
with a wide area of coverage. Selectable
dual-frequency gives you the option of two
beams, and both beams will cover the
bottom and provide high definition. The 20
degree center beam provides the highest
definition, while the 60 degree beam
provides wider coverage. Depth capability
is affected by such factors as bottom
hardness and water conditions. Whether
fishing in shallow to very deep water,
selectable dual-frequency is ideal for a
variety of conditions.
5
How Sonar Works
What’s on the 300 Series™ Control Head
Your 300 Series™ Fishfinder interface is easy to use. A combination of keys and
special features allows you to control what you see on the display. Refer to the
following illustration, and see Key Functions for more information.
2
1
3
4
5
6
Screen MENU key
1
VIEW key
2
4-WAY Cursor Control key
3
(LEFT, RIGHT, UP, or DOWN Cursor keys)
POWER/LIGHT key
EXIT key
4
5
6
The Control Head
6
Key Functions
Your Fishfinder user interface consists of a set of easy-to-use keys that work
with various on-screen views and menus to give you flexibility and control over
your fishing experience.
POWER/LIGHT Key
The POWER/LIGHT key is used to power the Fishfinder on and off.
You can also use the POWER/LIGHT key to adjust the backlight
and contrast of the display.
Power On the Control Head: Press the POWER/LIGHT key to power on the unit.
When the Title screen is displayed, press the MENU key to access the Start-Up
Options Menu.
Power Off the Control Head: Press and hold the POWER/LIGHT key for 3
seconds. A message will appear to indicate how many seconds there are until
shutdown occurs. To ensure that shutdown occurs properly and any menu
settings will be saved, your Fishfinder should always be turned off using the
POWER/LIGHT key.
Adjust the Backlight or the Display
Background Color: Press the POWER/LIGHT key
to access the Light and Background submenu.
Use the 4-WAY Cursor Control key to select
Light or Background, and then use the LEFT or
RIGHT Cursor key to change the settings. Press
EXIT to exit the Light and Background submenu.
NOTE: Your 300 Series™ Fishfinder will start up with the backlight on and will
automatically turn it off to conserve power.
Turn Sonar On or Off: From the Light and Background submenu, use the
4-WAY Cursor Control key to select Sonar. Use the LEFT or RIGHT Cursor key to
change the setting.
7
Key Functions
VIEW Key
The VIEW key is used to cycle through all available views. Press the
VIEW key to advance to the next view. Repeatedly pressing VIEW
cycles through all views available. Views can be hidden to optimize the system to
your fishing requirements (see Views or Setup Menu Tab).
NOTE: Press the EXIT key to cycle through the views in reverse order.
MENU Key
The MENU key is used to access the menu system. See The
Menu System for more information.
• Start-Up Options Menu: Press the MENU key during the power up
sequence to view the Start-Up Options menu.
• X-Press™ Menu: Press the MENU key once in any view to access the
X-Press™ Menu, which provides frequently-used menu settings that
correspond with the current view.
• Main Menu: Press the MENU key twice in any view to access the Main
Menu, which is organized under tabbed headings to help you find a
specific menu item quickly.
4-WAY Cursor Control Key
(LEFT, RIGHT, UP, or DOWN Cursor keys)
The 4-WAY Cursor Control key has multiple functions, which
depend on the view, menu, or situation.
• Menu Selection: Press the DOWN or UP Cursor keys to highlight a
menu option, then press the RIGHT or LEFT Cursor keys to change a
menu setting. The changes will be activated and saved immediately.
• Freeze Frame: In Sonar View and Down Imaging™ View, press any
arrow on the 4-WAY Cursor Control key to freeze the display and move
the active cursor to a location on the screen. A cursor dialog box will
display to show the depth of the location you choose.
• Active Cursor: Press any arrow on the 4-WAY Cursor Control key, and
the active cursor will appear on the screen.
Key Functions
8
NOTE: In Freeze Frame or Active Cursor mode, you can also make the cursor
move diagonally by pressing in between two of the arrows on the 4-WAY
Cursor Control key.
• Circular Flasher View (Ice Fishing Mode: On): Press the UP or DOWN
Cursor keys to move the Depth Cursor. Press the RIGHT or LEFT Cursor
keys to adjust the Zoom Range (see Views: Circular Flasher View).
EXIT Key
The EXIT key has multiple functions, which depend on the
situation:
• If an alarm is sounding, press the EXIT key to cancel the alarm.
• If a menu tab is selected, press the EXIT key to exit the menu mode and
return to the view.
• If a menu is active, press the EXIT key to return to the previous level in
the menu system.
• From any view, press the EXIT key to cycle through the available views
in reverse order.
• If Freeze Frame is active, press the EXIT key to return to a scrolling
display.
• If the Cursor is active, press the EXIT key to remove the cursor from the
display.
9
Key Functions
What’s on the Sonar Display
The 300 Series™ Fishfinder can display a variety of useful information about
Depth - Water depth; can be set to alarm when
the water becomes too shallow.
Temperature - Water surface temperature.
Timer - Elapsed time with Temp/Speed
Accessory.
Distance - Distance traveled with Temp/Speed
Accessory.
Average Speed - Average speed reading with
Temp/Speed Accessory.
Speed - If a Temp/Speed accessory is attached,
the Fishfinder can display the speed of the boat
and can keep a Triplog of nautical or statute
miles traveled.
Second Sonar Return - When the sonar signal
bounces betweenthebottomandthesurfaceof the
water and back again. Use the appearance of the
second return to determine bottom hardness. Hard
bottoms willshow astrong second return, while soft
bottoms willshow a very weak one or noneat all.
Cursor Dialog Box - Indicates cursor depth on
the display and the depth of the bottom directly
below the cursor.
NOTE: Entries in this view that list (with Temp/Speed) are available if the device is connected to
What’s on the Sonar Display
10
the area under your boat, including the following items:
High Sonar Intensity Return
Bait Ball
Fish - The Fishfinder displays fish as arches
and/or fish icons, and can be set to alarm
when a fish of a certain size is detected.
When a target is detected, a Fish ID+™
symbol appears on the display with the
depth displayed above it. The size of the
symbol indicates the intensity of the sonar
return. The unit will clearly show schools of
Bait Fish as "clouds" of different shapes and
sizes, depending on the number of fish and
boat speed.
Thermoclines - Layers of water with different
temperatures that appear at different depths
and different times of the year. A thermocline
typically appears as a continuous band of
many colors moving across the display at the
same depth.
Cursor - Available in Freeze Frame and can
be positioned in the Sonar View to provide
depth ofa sonarreturn and bottom depthbelow
the cursor.
the 300 Series™ Fishfinder.
RTS (Real Time Sonar) Window™
Structure - Where fish may be hiding.
Low Sonar Intensity Return
11
What’s on the Sonar Display
Understanding the Sonar Display
It is important to understand the significance of
the display. The display does not show a literal
3-dimensional representation of what is under the
water. Each vertical band of data received by the
control head and plotted on the display represents
something that was detected by a sonar return at
a particular time. As both the boat and the targets
(fish) may be moving, the returns are only showing
a particular segment of time when objects were
detected, not exactly where those objects are in
relation to other objects shown on the display.
The returned sonar echoes are displayed on the screen. As a new echo is
received, the historical data scrolls left across the view.
Real Time Sonar (RTS™) Window
A Real Time Sonar (RTS™) Window appears on the right side of the display in
the Sonar View only. The RTS Window™ updates at the fastest rate possible for
depth conditions and shows only the returns from the bottom, structure, and
fish that are within the transducer beam. The RTS Window™ plots the depth
and intensity of a sonar return (see Sonar Menu Tab: RTS Window™).
The Narrow RTS Window™
indicates the sonar intensity
through the use of colors. Red
indicates a strong return and
blue indicates a weak return.
The depth of the sonar return
is indicated by the vertical
placementof the returnon the
display depth scale.
What’s on the Sonar Display
The Wide RTS Window™
indicates the sonar intensity
through the use of a bar
graph. The length of the
plotted return indicates
whether the return is weak or
strong. The depthof the sonar
return is indicated by the
vertical placement of the
return on the display depth
scale. The Wide RTS
Window™ does not use
grayscale.
12
Sonar Colors: Original Palette
HIGH
Intensity Return
MEDIUM
Intensity Return
LOW
Intensity Return
Sonar Colors and Bottom View
As the boat moves, the unit charts the changes
in depth on the display to create a profile of the
Bottom Contour. The Sonar View displays the
sonar return intensity with different colors.
Strong returns often result from rocky or hard
bottoms (compacted sediment, rocks, fallen
trees), while weaker returns often result from
soft bottoms (sand, mud), vegetation, and small
fish.
The colors used to represent high, medium, to
low intensity returns are determined by the
palette you choose in the Sonar Colors menu
option. See Sonar Menu Tab to set the Sonar
Colors.
Sonar View: Original Palette
Strong Returns
(possibly rocks, tree limbs,
or other structure)
Sonar History: Historical Returns
scroll left across the view.
13
Weak Returns
(possibly vegetation
or small fish)
Strong Return
(possibly compacted
sediment or rocks)
RTS Window™
What’s on the Sonar Display
Use Bottom View to select the method used to represent bottom and structure
on the display. See Sonar Menu Tab to set the Bottom View.
Structure ID® represents weak returns
in blue and strong returns in red when
Sonar Colors is set to Original. If the
Sonar Colors palette is changed, the
Structure ID® will display the strongest
return as specified by the palette. See
Sonar Menu Tab: Sonar Colors for
more information.
What’s on the Sonar Display
WhiteLine
™ highlights the strongest
sonar returns in white, resulting in a
distinctive outline. This has the benefit
of clearly defining the bottom on the
display.
14
SwitchFire™
SwitchFire™ controls how the sonar returns are displayed in the Sonar Views.
SwitchFire™ settings are available in the Sonar Menu Tab.
To see the maximum sonar information available within the transducer beam so
more fish arches and better jig tracking are shown, choose Max Mode.
To see less clutter and more fish size accuracy interpreted from the transducer
beam, choose Clear Mode. See Sonar Menu Tab: SwitchFire™ for more
information.
Freeze Frame and Active Cursor
Freeze Frame and Active Cursor - Press any arrow on the 4-WAY Cursor Control
key, and the screen will freeze and a cursor will be displayed. Use the 4-WAY
Cursor Control key to move the cursor over a sonar return, and the depth of the
sonar return will be displayed at the bottom of the screen in the cursor dialog box.
The RTS Window™ continues to update in Freeze Frame. To return to a scrolling
display and exit Freeze Frame, press the EXIT key. Freeze Frame is available in
the Sonar, Split Sonar, and Sonar Zoom Views.
Instant Image Update
Instant Image Update - You can change a variety of sonar menu settings (such
as Sensitivity or Upper Range), and the adjustments will be shown instantly on
the screen.
15
What’s on the Sonar Display
What’s on the Down Imaging™ Display
Down Imaging™ uses its unique transducer and sonar technology to provide
definition profiling beams produce the detailed sonar data that you see on the
can interpret the structure and bottom contour, including the following items:
Depth - (water depth) can be set to alarm when
the water becomes too shallow.
Temperature - Water surface temperature.
Bottom Return - Use the appearanceofthe bottom
return to determine bottom hardness. Rock and
gravel provide a clearer sonar return than mud
and sand because hard objects reflect sonar
better than soft objects.
Topography Changes - The light part of the
display shows where the beam is hitting hard
bottom or rising terrain. The dark part of the
display indicates soft bottom (sand, mud) or
descending terrain.
Speed- If aTemp/Speedaccessory is connected,
the Fishfinder can display the speed of the boat
and can keep a Triplog of nautical or statute
miles traveled.
NOTE: Entries in this view that list (with Temp/Speed) are available if the accessory
What’s on the Down Imaging™ Display
16
information about the area directly below your boat. The razor-thin, highdisplay. Down Imaging™ reveals a variety of recognizable features so that you
Upper Range
Clouded Area may indicate a bait ball and
White Streaks may indicate fish.
Structure
Shadows- Result from a lack of reflected
sonar from a particular area and can be as
valuable for interpretation than the sonar
reflected bythe object itself. Use shadows to
help you see the image in 3 dimensions,
oriented in space. You can gain insight into
the actual shape of an object, or the depth
to which it has sunk into the bottom,
through shadows on the display. Objects
standing on the bottom cast a sonar
shadow. The longer the shadow, the taller
the object. Fish also cast shadows. You can
use the shadow to interpret how close the
fish is to the bottom.
is connected to the 300 Series™ Fishfinder.
Lower Range
17
What’s on the Down Imaging™ Display
Understanding the Down Imaging™ Display
The images you see on the Down Imaging™
display are produced using sonar technology. Each
time the unit pings, a strip of data representing all
the echoes received by the transducer are put
together on the display to form the image that you
see. Like traditional 2D Sonar, the sonar history
scrolls left across the screen.
Interpreting the Display
Down Imaging™ beams “illuminate” the bottom contour, structure, and fish.
The beams are wide (side to side) but very thin front to back.
Use the light and dark parts of the display to interpret the objects under your
boat as follows:
• Dark shades represent soft returns (mud, sand) or descending terrain.
• Light shades represent denser terrain (timber, rocks) or rising terrain. A
very hard bottom may appear as white on the display.
• White Streaks or Clouds may represent fish on the display.
• Shadows are not caused by light but by the lack of a sonar return.
Objects standing on the bottom cause a sonar shadow to appear on the
display. The longer the shadow, the taller the object. Fish may also cast
shadows. You can use the shadow to interpret where the fish or object
is located in relation to the bottom.
What’s on the Down Imaging™ Display
18
Down Imaging™ Sensitivity
Use Down Sensitivity to control how the sonar returns appear on the display.
Increase the sensitivity to reveal weaker returns that may be of interest,
especially in very clear water or greater depths. Decrease the sensitivity to
eliminate the clutter from the display that is sometimes present in murky or
muddy water. See Down Imaging™ X-Press™ Menu: Down Sensitivity for
more information.
Freeze Frame and Active Cursor
Freeze Frame and Active Cursor - Press any arrow on the 4-WAY Cursor
Control key, and the screen will freeze and a cursor will be displayed. Use the
4-WAY Cursor Control key to move the cursor over a sonar return, and the depth
of the sonar return will be displayed in the cursor dialog box.
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What’s on the Down Imaging™ Display
Views
The sonar information from your Fishfinder is
displayed on your screen in a variety of easy-to-read
views. There are many views available on your
Fishfinder.
• Default View: When you first power up the 346c DI control head, Down
Imaging™ View will be the default view.
• Cycle: When you press the VIEW key repeatedly, the display cycles
through the available views on your screen. When you press the EXIT
key, the display cycles through the available views in reverse order.
• Customize: You can display or hide any view to suit your fishing
preferences. See the following pages for more information about each
View.
NOTE: When you change any menu settings that affect the sonar, the view will
update immediately. You don't have to exit the menu to apply the change to the
screen.
Views
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To customize your view rotation:
You can choose which views are hidden or visible in your view rotation.
1. Press the MENU key twice to access the tabbed Main Menu, then
press the RIGHT Cursor key until the Setup tab is selected.
2. Press the DOWN Cursor key to highlight Select Views, and press the
RIGHT Cursor key to access the Select Views submenu.
NOTE: If the Select Views option does not appear under the Setup tab, change
the User Mode to Advanced.
3. Press the UP or DOWN Cursor keys to select a View.
4. Press the LEFT or RIGHT Cursor keys to change the status of the view
from Hidden to Visible or vice versa.
To change the Digital Readouts:
Each view displays digital readout information (such as speed or time), which
varies with the view selected and the accessory attached. The digital readouts
on the Sonar View can be customized. See Setup Menu Tab: Select Readouts
for more information.
1. Press the MENU key twice to access the tabbed Main Menu, then
press the RIGHT Cursor key until the Setup tab is selected.
2. Press the DOWN key to highlight Select Readouts, and press the RIGHT
Cursor key to access the Select Readouts submenu.
NOTE: Ifthe Select Readoutsoptiondoes not appear under the Setup tab, change
the User Mode to Advanced.
3. Press the UP or DOWN Cursor keys to select a Readout position, then
press the RIGHT or LEFT Cursor keys to choose what will be displayed in
that position. To hide the data window, select Off.
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Views
Sonar View
Sonar View presents a historical log of sonar returns. The most recent sonar
returns are charted on the right side of the display. As new information is
received, the historical information scrolls left across the display.
• Upper and Lower Depth Range numbers indicate the distance from the
surface of the water to a depth range sufficient to show the bottom.
• Depth is automatically selected to keep the bottom visible on the display,
although you can adjust it manually as well (see Sonar X-Press™ Menu).
• Digital Readouts shown on the display will change based on the Select
Readouts settings or the optional-purchase accessories attached (see
Setup Menu Tab: Select Readouts).
• Freeze Frame - Use the 4-WAY Cursor Control keyto freeze the display and
move the cursor over a sonar return. The depth of the sonar return will be
displayed at the bottom of the screen in the cursor dialog box.
Sonar View
Depth
Temperature
Upper Depth
Range
Triplog
Speed
Sonar History
Window
Cursor
Dialog Box
NOTE: If the Depth number is flashing, it means that the unit is having trouble
locating the bottom. This usually happens if the water is too deep, the transducer is
out of the water, the boat is moving too fast, or for any other reason that the unit
can’t accurately receive continuous data.
Views
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Cursor
RTS Window™
Lower Depth
Range
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