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4. Start turning the boat in slow circles (with the boat's speed below
Note: If necessary, you can quit the correction process by pressing
the standby or disp . If you then want to repeat the deviation
correction, return to the SWING COMPASS screen.
5. Continue slowly turning the boat until the control unit beeps and
Note: If the deviation figure exceeds 15° or the display shows no
deviation value, the compass is being affected by ferrous objects on
your boat. You should move the compass to a better location. Higher
deviation figures are acceptable on steel boats.
Aligning the compass heading
1. Once the deviation is displayed, press the disp key to move onto
2. Manually steer the boat on a steady course at a speed which
3. If you have a GPS connected to your autopilot:
4. Use -1 , +1 , -10 and +10 to adjust the displayed heading until it
5. Press and hold standby for 2 seconds to exit Seatrial Calibration
ST7001+ Autopilot Control Unit - Owner's Handbook
2 knots). You will need to complete at least two circles, taking at
least 2 minutes to complete each 360°:
the display will show a TOO FAST message if you turn the boat
•
too quickly for the course computer to correct the compass –
if you see this message apply less helm to turn in a larger circle
displays the DEVIATION screen to indicate that the autopilot has
completed the deviation correction.
This screen shows the maximum deviation encountered over
360° (not as an east/west value).
the Heading Alignment screen ( ALIGN HDG ).
enables you to hold that course.
•
increase the boat speed to more than 3 knots
press the auto key: the autopilot will then set the heading to
•
agree with the COG (course over ground) heading received
from the GPS
•
because many factors can cause a difference between heading
and COG (such as tides and leeway affecting the boat) you
must then fine-tune the heading alignment so it matches the
boat's steering compass or a known transit bearing
matches boat's steering compass or a known transit bearing.
and save the new compass settings.
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