Chapter 2: Setting Up Graphic Displays 7-2-21
ST290 Instrument System Owner’s Handbook
Compass calibration requirement
If you have a Raymarine autopilot, the autopilot will supply heading
information,and you shouldcalibrate thecompassinaccordance with the
appropriate autopilot procedures in Section 8, Chapter 4.
Ifyour ST290systemhasits own, dedicatedSmart Heading Sensorand is
not receiving heading information from any other source, use the
following procedures to calibrate the compass.
Swinging the compass to correct for magnetic deviation
To correct for magnetic deviation, ensure the SWING COMPASS page (see
Figure 2-22 ) is displayed, then:
1. Press the button to display the TURN BOAT page (see Figure 2-22 ).
2. Start turning your boat in circles. Do not turn too quickly. A 360° turn
should take at least 3 minutes. If the boat is turning too quickly, the
message TURN RATE TOO HIGH is displayed. If this occurs, immedi-
ately reduce the rate of turn.
3. When the procedure is complete, the SWING COMPLETE screen is dis-
played, and the amount of deviation is shown.
4. Press the button to proceed to the ALIGN HEADING page.
Note: If the deviation figure exceeds 15° or the display shows no devia-
tion value, the compass is being affected by ferrous objects on your boat.
You should move the compass to a better location. Higher deviation fig-
ures are acceptable on steel boats.
Setting compass alignment
After completing the deviation correction procedure (swinging the
compass), check the compass alignment:
To carry out compass alignment:
1. Select the ALIGN HEADING page (see Figure 2-22 ).
2. Either:
• Steer your boat on a steady course at a speed that enables you to
hold that course, and use the or button to manually set the
correct heading value.
or
• If you have GPS, steer your boat at a speed above 4 knots then
hold down the button for 1 second, to set the COG as the head-
81183_2 S7.book Page 21 Wednesday, May 7, 2003 1:52 PM
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