Navman 8084, 8120 User Manual

Navman

8120/8084

Fuel, AIS, & Radar
Addendum 06/07

w w w . n a v m a n . c o m

Warning

AIS: The AIS features on this chart-plotter are designed as a safety aid only and do not
guarantee safety at sea. AIS transmission is mandatory on some, but not all, vessels. AIS
should be used to complement radar, but AIS is not a substitute for radar.

Notes

• AIS and Radar functions require optional accessories to be installed.

• Radar is available in 2 kW, 4 kW, 6 kW units.

• The setup menu can be opened by pressing
(8120) then select System

:

Sonar

Disable any sonar transducer and disable sonar functions.

A sonar transducer is fitted. Enable sonar operation.

Radar

No appropriate Radar system is fitted. Disable RADAR.

An appropriate Radar receiver is fitted.

Enable Radar.

AIS

No appropriate AIS receiver is fitted. Disable AIS.

An appropriate AIS receiver is fitted.

Enable AIS.

twice (8084) /

Appendix

8084 Size: 190 mm (7.48“) H x 285 mm (11.22“) W x 76.8 mm (3.02“) D. Allow 3 mm
clearance on each side for dust cover.

8084 Display: 213.4 mm (8.4”) diagonal, TFT color, 800 x 600 pixels.

CPA - Closest Point of Approach. The closest distance two vessels will come to each

other based on their current course and speed.

Radar guard zone - An area around the boat, set up by the operator and defined by
distance and bearing. If an object (e.g. another boat) enters the radar guard zone, an
alarm is activated.

Rain clutter - Heavy rain or snow can cause interference with the radar image.

Range (radar) - The distance between the centre of the radar image and the outer range

ring. The scale is shown in the top left corner of the radar window.

Range rings - Concentric circles extending from your boat (usually at the centre of the
radar window) and used to estimate distances to objects. The scale is shown in the top
left corner of the radar window.

Route - Two or more waypoints linked in sequence to form a course for the boat.

Sea clutter - Rough seas can cause interference with the radar image.

NAVMAN 8120/8084 Fuel, AIS, & Radar Addendum2

Fuel functions and display

CAUTION

!

!

WARNING

What the fuel computer does

To ensure the fuel data is accurate:

When you add or remove fuel from a tank, tell the 8120/8084.

If the boat has petrol/gasoline sensors, calibrate them during installation or if the fuel

readings seem inaccurate.

Choose an appropriate type of boat speed sensor or GPS source to calculate economy,

range and the fuel consumption curve.

If the boat uses a paddlewheel sensor to measure speed, calibrate it during installation or

if the speed readings seem inaccurate.

Low fuel alarm

To set a low fuel alarm for a tank:

1 Press

Setup tanks

2 On a multi-tank boat, select the tank to set

the alarm for.

3 Select Tank alarm and enter a fuel level

to trigger the low fuel alarm; or enter zero
to disable the alarm.

twice, select Fuel, then select

.

Boat speed sensors

Selecting a boat speed sensor

The fuel calculations can use boat speeds
from the GPS, or from a paddlewheel sensor
or pitot sensor if these optional sensors are
installed:

Paddlewheel and pitot sensors measure

the speed through the water; GPS speed is
speed over ground; these sensors can give
different values for Range, Economy and
the fuel consumption curves.

A pitot sensor is more accurate than a

paddlewheel sensor at high speeds but is
not accurate at low speeds. A paddlewheel
sensor is more accurate than a pitot sensor
at low speeds.

When a low fuel alarm is set, the alarm’s fuel
level is shown on the fuel display tank levels
as a red bar. The alarm can also be set using
the Alarms setup menu.

To select an optional speed sensor

1 Press

Speed source

2 To use a paddlewheel or pitot sensor,

select Water speed, otherwise select
Ground speed to use GPS speed.

3 If you selected Water speed and you have

both a paddlewheel sensor and a pitot
sensor:

i Press

select Speed type

ii Select Paddlewheel or Pitot

Tip: You can select a different speed

sensor during a trip.

twice, select Fuel, then select

.

, select SmartCraft and

.

NAVMAN 8120/8084 Fuel, AIS, & Radar Addendum 3

Water speed and ground speed

A paddlewheel sensor and a pitot sensor
measure water speed, the boat speed
through the water. A GPS measures ground

Water speed is better for measuring the
boat’s potential performance, Ground speed
is better for going to a destination because it
takes currents into account.

speed, the boat speed over the bottom of
the water. If there is a current, then these
speeds will be different, and the log, trip
log, economy and range will be different, as
shown below.

When the current is from ahead, ground speed is less than water speed

Water speed 10 knots

Current 4 knots

Gives a ground speed of 6 knots

Water speed 10 knots

Gives a ground speed
of about 8 knots Current 4 knots at 45º

For this example:

If the boat travels for one hour, uses 3 gallons of fuel per hour and has 50
gallons of fuel left:

Speed Log Economy Range

Using water speed: 10 knots 10 nm 3.3 nm / gal 165 nm

Using ground speed: 6 knots 6 nm 2.0 nm / gal 100 nm

When the current is from behind, ground speed is more than water speed

Water speed 10 knots

Gives a ground speed of 14 knots

Current

4 knots

Water speed 10 knots

Gives a ground speed of about 13 knots

Current 4

knots at 45º

For this example:

If the boat travels for one hour, uses 3 gallons of fuel and has 50 gallons of fuel left:

Speed Log Economy Range

Using water speed: 10 knots 10 nm 3.3 nm / gal 165 nm

Using ground speed: 14 knots 14 nm 4.7 nm / gal 235 nm

NAVMAN 8120/8084 Fuel, AIS, & Radar Addendum4

Calibration

Calibrate petrol/gasoline fuel flow
sensors during installation, or if the fuel
readings seem inaccurate and the other
troubleshooting suggestions do not help.

Note

SmartCraft fuel sensors and NAVMAN

diesel sensors are factory calibrated and
should never need recalibrating.

On a multi engine boat, calibrate each

engine’s sensor. This can be done at the
same time with a portable tank for each
engine or at different times using one
portable tank.

Calibrating a sensor requires accurate

measurement of the fuel consumption.
This is best done using a small portable
tank. At least 4 gallons (15 litres) of fuel
should be used to ensure an accurate
calibration.

It is often very difficult to fill underfloor

tanks to the same level twice due to air
pockets, so the more fuel used, the more
accurate the calibration.

To calibrate the sensor(s):

1 Record the level of the fuel in the tank(s).

2 Connect the portable tank(s) to the engine

through the fuel sensor(s).

3 Run the engine at normal cruising speed

until at least 4 gallons (15 litres) of fuel has
been used per engine.

4 Check the actual amount of fuel used per

engine by refilling the portable tank(s) to
the original level and noting the reading(s)
of the fuel dispenser’s gauge.

5 Press

Setup engines

6 On a single engine boat, select

Calibrate and change the displayed

twice, select Fuel, then select

.

value to be equal to the reading of the fuel
dispenser’s gauge, then press

On a multi-engine boat select the engine.

Select Calibrate and change the
displayed value to be equal to the reading
of the fuel dispenser’s gauge, then press

. Repeat for the other engines.

.

NAVMAN 8120/8084 Fuel, AIS, & Radar Addendum 5

AIS

AIS is short for Automatic Identification
System. The International Convention
for Safety of Life At Sea (SOLAS) requires
all vessels greater than 300 tons and all
passenger vessels to be equipped with AIS
Transponders. All vessels equipped with
AIS permanently broadcast via one or more
of the two dedicated VHF channels. This
transmission may include information about
the vessels MMSI-number, its call sign, name,
position, course, heading, speed, rate of turn
and type of vessel.

This unit can receive and display AIS
information when connected to an AIS
receiver. Available AIS vessels transmitting in

Viewing AIS Vessels

A typical AIS window shows:

the local area are shown on the chart when
this feature is enabled.

The following AIS receivers are supported by
this unit:

• Comar SLR200 (external GPS).

• Weatherdock Two Channel AIS Receiver
“EASY AIS”, Part No. 5-A-013 (external GPS).

• NASA Marine AIS Engine 2 channel
MultiPlex Receiver (external GPS).

Other AIS receivers may work but have not
been tested with this unit.

To enable AIS from the system menu check
the AIS box.

A AIS Vessel

B Dangerous Vessel

C Projected Course

D Data Box

E Range Rings

E

B

NAVMAN 8120/8084 Fuel, AIS, & Radar Addendum6

A

C

When the cursor is placed over an AIS
vessel for at least two seconds, a data box
appears at the bottom of the window with
information about the AIS vessel.

For complete AIS information of the AIS
vessel place the cursor over an AIS vessel for
at least two seconds and press

Press either
information.

or to clear the

.

Dangerous Vessels

The 8120/8084 calculates the time of closest
point of approach (TCPA) and closest point of
approach (CPA) for each AIS vessel.

This is used to determine potential dangerous
vessels. If the TCPA and the CPA is below
the trigger values then it will be considered
dangerous.

A dangerous vessel is indicated on the chart
by a red circle around the icon.

AIS Windows

TCPA 15 min

CPA 0.5 nm

To go to the AIS windows, press , select

to select

More, select AIS, then press

one of the two windows: Vessels or Safety
msgs (rx).

If there are more items than will fit on the
window, press

or to see the others.

or

NAVMAN 8120/8084 Fuel, AIS, & Radar Addendum 7

Vessels

This is a sorted list of vessels currently being
received by the AIS receiver. The maximum
number of vessels that the system will
support is 250. Once maximum is reached,
vessels furthest away from the current
location will be replaced. A vessel will be
removed from the list if no information is
received within 6 minutes from the last
message.

Displaying an AIS vessel on the chart

1 Press or to select a vessel.

2 Press

Instrument switches to chart window, with
the selected vessel position in the middle.

and select Display. The

Displaying Full AIS Details

1 Press or to select a vessel.

2 Press

press .

and select More Info or