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SSC200 User’s Manual
Page 12 Revision 1.8
4. While continuing to turn the vessel as indicated in step 3, remove the power from the
compass and reapply power (this initiates deviation calibration).
5. Continue turning the vessel through four complete circles in less than 10 minutes from
the time power was applied.
6. Successful deviation is indicated when the SSC200 outputs the following sequence:
a) 0 Degrees for two seconds followed by
b) 90 degrees for two seconds followed by
c) 180 degrees for two seconds followed by
d) 270 degrees for two seconds followed by the actual heading
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.
3.2 Installation-Offset Correction
After installation and successful deviation calibration, it is important to perform installation-
offset correction so that the displayed compass heading, pitch, and roll match the actual vessel
heading, pitch, and roll. Installation-offset correction is done using one of four possible
procedures.
1. Maretron Display Product Initiated (Section 3.2.1)
2. Manual Installation-Offset Correction (Section 3.2.2)
3. Through the NMEA 0183 Interface (Appendix A)
4. Through the NMEA 2000
®
Interface (Appendix B)
The preferred method for installation-offset is to use a Maretron display (procedure 1) which
will automatically calibrate the SSC200 without physically adjusting the compass as describe
under procedure 2 (Manual Installation-Offset Correction). As an alternative to procedures 1
and 2, users with direct access to the NMEA 0183 and NMEA 2000
®
interfaces can perform
installation-offset correction through the NMEA 0183 interface (see Appendix A) or the NMEA
2000
®
interface (see Appendix B).
3.2.1 Maretron Display Product Offset Correction
Installation-offset correction can be performed using a Maretron display product (e.g.,
DSM200). The procedure is as follows:
1. Make sure the vessel is laying in flat water on a known heading.
2. Use the display’s menu items to locate and send the compass installation-offset
correction command (please refer to display product user’s manual).
3.2.2 Manual Installation-Offset Correction
Manual installation-offset correction is performed by physically aligning the compass with the
vessel. The procedure is as follows:
1. With the vessel laying flat in the water, adjust the roll angle of the SSC200 by adding
small washers or spacers between the mounting bracket holes and mounting surface
until the display reads zero for the roll angle (skip this step if you are not interested in
viewing the vessel’s roll angle).