Garmin GFS 10 - Manual (Page 4)

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Select the option to add fuel.
Set the total fuel capacity of the boat to
accurately calculate remaining fuel based on
fuel-flow rate. To do so, go to the configuration
options for NMEA 2000 devices on your
marine instrument, or the My Boat information
section of your Garmin chartplotter.
The Garmin chartplotter or marine instrument
must be powered on to calculate remaining fuel
based on fuel-flow rate.
Using fuel-level information with a
Garmin chartplotter or marine
instrument
Connect the wiring harness on the GFS 10 to
the fuel gauge (level-sensor) of your boat to
receive fuel-level information.
Calibrate the fuel-level on your Garmin
chartplotter or marine instrument. While in
still water, go to the configuration options
for NMEA 2000 devices on your Garmin
chartplotter or marine instrument and enter a
calibration point that corresponds to the current
level of your fuel tank.
Entering more calibration points will provide a
more accurate reading. For example, entering
five calibration points (empty tank, 1/4 tank,
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