ComNav Marine 1420 Autopilot System
Fluxgate Compass Compensation
In order to complete the setup of a
Fluxgate Compass, it is necessary to
take a short trip with your boat.
Put your tools and other magnetic objects
in storage places away from the Fluxgate
Compass.
Check your hydraulic installation for any
leaks or loose components.
Move your vessel to a location that is:
• Free from other traffic.
• Far away from large magnetic objects.
⇒ Do not attempt to compensate the
compass near a steel bridge, a
submarine cable, or a steel ship.
Repeat the Setup Routine, starting at
Step 1 and continue until the point in
Step 9 where all the lights are turning off
and on in a rotating pattern. Do not turn
the autopilot off.
The Autopilot is now ready to measure &
compensate for any irregularities in the
magnetic field aboard your vessel.
10. Slowly turn the boat in as small a
circle as possible. Maintain as
steady a rate of turn as you can.
Use a boat speed and rate of turn that
results in the turn taking between about
one to three minutes to complete.
It should only take slightly more than one
full turn to complete the measurements.
While the routine is running, the lights will
continue to flash in a rotating pattern.
⇒ If the lights keep rotating after several
turns, or if the light above the Pilot
Key flashes, the measurements were
not successful. If this occurs, try
re-locating the compass some
distance away from its present
location; also, re-check the wiring.
Then repeat this Step.
When the measurements are
successful, the Autopilot will turn off.
The Setup Routine is now completed.
When all is done, permanently mount
your Fluxgate Compass in its location,
using four #10 (5mm) fasteners made of
non-magnetic materials such as high
quality stainless steel or brass.
Go to Finishing the Setup, below.
Magnetic Compass Alignment
You have completed Step 9 and the light
below the Speed Key
is flashing.
Turn your vessel, or simply turn the
compass, until the compass is pointing
due North.
11. Press the Speed Key
The Autopilot’s Heading display is now
aligned to the magnetic direction values
sensed by your magnetic sensor.
The autopilot will turn off.
The Setup Routine is now completed.
Finishing the Setup
Do a final check of your hydraulic
installation for any leaks or loose
components.
Please be aware that the Autopilot can
not adjust for any differences between
North, as shown by your compass, and
the real direction of Magnetic North.
You alone are responsible for the
accuracy of your compass in its location.
Document PN 29010012 V1.3
43
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