ComNav P4 Installation and Operation Getting Started
Document PN 29010100 V1r0 - 116 -
NOTE: NMEA0183 or NMEA2000 compasses (e.g., the ComNav G2/G2B GNSS GPS
Compass) typically
do not require on-the-boat calibration. You should however refer to the
Installation and
Operation manual that came with your NMEA compass to verify this.
Even if your NMEA compass does require calibration, it may not be necessary to
set the
value in the P4 Autopilot. Many – if not most – NMEA compasses can store their
own
calibration value. If that is the case in your application, you should skip the steps below, and
follow
the instructions that came with your NMEA compass. However, if you wish to set a
calibration value for an NMEA0183 compass in the
autopilot, you may do so. In fact, you
may set two values – one for each of
NAV1 and NAV2.
Magnetic Sensor
There is an alternative calibration procedure, for Magnetic Sensors only:
1. Power up the autopilot in the Dockside Setup menu.
2. Select Compass Setup and press the ENTER button.
3. Highlight “Analog Compass” and set the parameter to “Mag”; press the ENTER
button
4. After the autopilot has auto-detected the compass, it will ask you if you want to “Set
North
Now?” Press the STARBOARD button.
5. Manually steer the boat so that it is pointing to Magnetic North. Hold it on that
heading
and push the ENTER button. The autopilot will store the current heading
and reference it as
000° Magnetic, and then automatically return to the Compass
Configuration menu.
6. Highlight “Exit” and then press the ENTER button to return to the Dockside Setup
menu.
7. Exit the Dockside Setup menu. After a brief pause the autopilot will
restart and
automatically go into STANDBY mode.
Compass Setup – Final Steps
At this point, the entire Compass Setup procedure should be complete.
All of the compass settings and compensation/calibration values will be retained when the
autopilot is turned off. As a backup, you should manually record all compass selections
and settings, in the Settings chapter at the back of
this manual.
It should not be necessary to re-compensate or re-calibrate any of your compasses again,
unless the electrical/magnetic environment on your boat changes substantially. For
example if you add any new electronic equipment, etc. You should also redo the initial
compass setup if you travel with the vessel further than approximately 10° of Latitude away
from the initial setup location– or to an
area where the local Magnetic Deviation is known to
be different (for example where there are a lot of
submerged/wrecked vessels).
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