Chapter 1: Procedures
13
Although compass calibration removes most of the alignment error, small errors (a
few degrees) may remain. Once you have completed the initial compass calibration,
you can make further adjustments to the alignment without having to swing the
compass again.
Check the heading reading against a number of known headings, plot a deviation
curve, and determine the heading alignment value that will give the lowest average
alignment error. You can then enter this value on the Heading Alignment screen, as
described above.
If the average heading error is more than 5°, check there are no items close to the
compass that could cause an unwanted magnetic influence. You should also consider
moving the fluxgate compass and performing the compass deviation correction
procedure again, circling more slowly and in more favorable conditions.
Aligning rudder bar
If the rudder reference transducer is fitted, use this procedure to align the rudder bar
on the Pilot Controller display:
1. Access the ALIGN RUDDER screen in Seatrial calibration:
i.
From Standby mode, hold down
standby
for 2 seconds, then press
disp
twice
to see the SEATRIAL CAL screen.
ii. Press
auto
to enter Seatrial calibration, then press
disp
tree times to see the
ALIGN RUDDER screen.
2. Steer straight ahead then use
-1,
+1
,
-10
and
+10
or the
rotary control
to set the
displayed rudder bar to zero.
2 sec
D10777-1
Align the autopilot heading
a
b
Save changes
To:
• save deviation correction
• save heading alignment
• return to STANDBY mode
Autopilot heading
Steering compass
=
Known
heading
or
or
Adjust the autopilot heading so it shows the same value as the boat's steering compass
Coarse adjustment:
If COG is available from GPS, press to set autopilot heading to
COG value, then fine tune manually (see below).
Fine adjustment:
If COG is not available (or after setting heading to COG),
align autopilot heading manually:
ST6002 & ST7002
ST8002
81307_1.book Page 13 Wednesday, December 19, 2007 11:17 AM
