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SSC300 User’s Manual
Page 12 Revision 1.0
3. Through the NMEA 0183 Interface (Appendix A)
4. Through the NMEA 2000
®
Interface (Appendix B)
All the procedures require that the vessel be turned in consecutive circles during which time the
SSC300 uses changing heading information along with readings from the angular rate sensor to
calculate hard and soft iron magnetic deviation. Upon a successful completion of deviation
calibration, the SSC300 stores the deviation values in permanent memory for subsequent
compensation. Under certain conditions (e.g., turning to fast or to slow), the SSC300 will not
successfully complete the calibration process and the SSC300 will not store the deviation values
in its permanent memory. Therefore, it is important to verify that the deviation calibration process
completed successfully.
The preferred method for deviation calibration is to use a Maretron display (procedure 1)
because you receive direct feedback on the calibration process with a clear indication of a
successful or unsuccessful deviation calibration. Deviation calibration done automatically at
power-up (procedure 2) is less desirable than procedure 1 because it is more difficult to verify
that a successful deviation calibration completed. As an alternative to procedures 1 and 2, users
with direct access to the NMEA 0183 and NMEA 2000
®
interfaces can perform magnetic
deviation calibration directly through the NMEA 0183 interface (see Appendix A) or the NMEA
2000
®
interface (see Appendix B). These direct access methods also provide an indication of a
successful deviation calibration or an indication of an unsuccessful deviation calibration and the
corresponding reason for the failure.
3.3.1 Maretron Display Initiated Deviation Calibration
Maretron display initiated deviation calibration is accomplished by turning the vessel through
consecutive circles while the SSC300 receives a command from a Maretron display product
(e.g., DSM150, DSM250, or N2KAnalyzer software). The procedure is as follows:
1. Ensure that the compass has been properly installed per Section 2.
2. Warm up the compass by operating it for approximately 10 minutes.
3. Turn the vessel (either direction) such that you complete a full 360° turn in 2½ minutes
or less (try not to go below 1 minute for a complete circle).
4.
While continuing to turn the vessel as indicated in step 3, use the display’s menu items
to locate and send the deviation calibration command (please refer to the display
product user’s manual).
5. Continue turning the vessel through at least three complete circles until the display
indicates a successful deviation calibration.
While turning the vessel, try to maintain a circle by holding the rudder at a constant angle. In
addition, try to minimize the vessel’s pitch and roll by calibrating on calm, flat water.
After deviation calibration is complete, the results of the deviation calibration, which indicate the
quality of the compass installation environment, may be seen using a Maretron display product
(e.g., DSM150, DSM250, or N2KAnalyzer software). This allows you to compare different
installation points on a vessel to determine the optimum location for the SSC300.