Simrad AUTOPILOT SYSTEM AP50 - Manual (Page 136)

Simrad AP50 Autopilot
134
20221032B
After calibration, check the compass readout against a known
reference, compensated compass, or leading line. If the reading
is correct (±3° for magnetic compass, ±0.5° for gyrocompass)
except for a fixed offset, proceed to the next menu item by
pressing the (STBD) button or return to STANDBY mode by
pressing the
STBY
(STBY) button.
Note ! If an optional NMEA compass from Simrad or another
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. This offset may be present as a result of
the compass being installed with a lubber line offset or if 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.
This means that you can have individual offsets for each
compass installed.
SEATRIAL
Compass NMEA1
Calibration
Offset +005°
Heading 288°
Speed source Man
Set cruising speed --kt
Select the amount of correction by turning the course knob to
offset the heading to agree with the known, accurate heading.
The Offset value can be either positive or negative.
Note ! If an Offset still exists after having accounted for it, one of the
following problems may still exist:
• The heading reference to which you are comparing the
compass is not accurate.
• The automatic calibration obtained by the compass is not
correct. This may be due to a large magnetic influence near
the compass (relocation may be required) or to excessive
wave condition during calibration.
Note ! Do not compare with GPS’ COG, since your GPS is showing
course, rather than heading.
Proceed to the next menu item by pressing the (STBD)
button or return to Standby mode by pressing the
STBY
(STBY)
button.