Operation Manual

8120 Installation and Operation Manual62
17-4 Setup > GPS
Press
MENU
once or more until the Setup
menu is displayed, then select GPS:
GPS Source
• NMEA: Use the external GPS antenna
supplied or an external GPS or DGPS
source connected via NMEA (see section
18-12).
• NavBus: Use an external GPS or DGPS
source connected via NavBus (see section
18-11).
DGPS Source
Refer to section 18-5
Restart GPS
Refer to section 18-5
Static Navigation
When the boat stops or moves very slowly,
the calculated GPS speed and course become
erratic. Static navigation allows the erratic
values to be filtered:
• 0.01 to 99.9: If the boat speed is slower
than this, the speed is displayed as zero
and the course stays unchanged.
• 0 (Off): The calculated speed and course
are always used.
Speed and Course Filter
Waves and wind cause the boat speed and
course to fluctuate slightly. To give stable
readings, the Instrument calculates these
values by taking several measurements and
averaging them.
A lower value averages measurements
over a shorter period of time. This gives
the most accurate value but has the most
fluctuations.
A higher value averages measurements
over a longer period of time. This gives
the most stable value but will ignore some
sudden speed changes.
Set the Speed and Course filters to the lowest
values which give stable readings. The range
of each filter is 1 to 60 seconds or Off (0).
17-5 Setup > Fuel
Fuel setup requires optional petrol/
gasoline, diesel or SmartCraft sensors
to be installed. Set Num engines
first to enable the fuel functions.
Press
SETUP
then select Fuel:
Tank full
Tells the Instrument you have filled a fuel
tank (see section 12-1).
Set remaining
Tells the Instrument you have added or
removed fuel (see section 12-1).
There is a choice of Auto, Short,
Medium or Long. The Auto setting is
recommended.
Pulse power
This can be used to specify the power output
of the transmitted ultrasonic pulse. Low
power output conserves the battery and
produces a clear display in shallow water.
There is a choice of Auto, Low, Medium or
High. The Auto setting is recommended.