Instruction manual

Table Of Contents
Simrad AP35 Autopilot
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Compass calibration
This function will activate the automatic compass calibration procedure.
Note ! The GI51 Gyro Interface is pre-calibrated for Simrad RGC gyro compasses.
When other gyro compasses with synchro 1:1 is connected to GI51, it is
recommended to perform the automatic compass calibration in order to
calibrate the GI51 Interface/input signal.
Before you begin the compass calibration procedure, make sure you have
enough open water around you to make a full clockwise turn with the boat.
Let the boat turn at idle.
The calibration should be done in calm sea conditions and with minimal
wind to obtain good results.
INSTALLATION
RFC COMP
calibration?
INSTALLATION
RFC COMP
calibrating
INSTALLATION
Calibration
confirmed
1. Begin turning the boat to starboard.
2. Start compass calibration by turning the course selector clockwise.
3. When the calibration is completed, (after having completed
approximately 1 1/4 turns), it will be confirmed in the display.
If the compass is close to disturbing magnetic objects, the compass
calibration may fail, and the display will show:
INSTALLATION
Calibration
failed
In that case move the compass to a better location and re-calibrate.
After calibration, check the compass readout against a known reference,
other compass or leading line. If the reading is correct (+/-3°) except for a
fixed offset, use the COMPASS OFFSET setting to input a fixed correction
to the heading readout. Press STBD [>] button to proceed to next menu item.
Note ! If an optional NMEA compass from Simrad or other manufacturer is
installed, refer to the optional compass manual regarding calibration.
Compass Offset
The compass OFFSET feature allows you to correct for a constant compass
heading offset, that may be present as a result of the RFC35 being installed
with a lubber line offset or a fixed offset remains after the calibration
procedure has been completed. The value of compass offset is specific to the
heading sensor that is selected at the time the offset is entered. (For multiple
heading sensor offset procedure, choose Compass in User Setup. Refer to
User Set-up Menu, page 25. Then re-enter Installation, Compass Offset, and
set the required offset for chosen compass, or refer to separate GI51
manual).