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2. Manual Installation-Offset Correction (Section 3.2.2)
3. Through the NMEA 0183 Interface (Appendix A)
4. Through the NMEA 2000
The preferred method for installation-offset is to use a Maretron display (procedure 1) which will
automatically calibrate the SSC300 without physically adjusting the compass as describe under
procedure 2 (). As an alternative to procedures 1 and 2, users with direct access to the NMEA
0183 and NMEA 2000
0183 interface (see Appendix A) or the NMEA 2000
3.2.1 Maretron Display Product Offset Correction
Installation-offset correction can be performed using a Maretron display product (e.g., DSM150,
DSM250, or N2KAnalyzer software). 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 SSC300 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).
2. With the vessel laying flat in the water, adjust the pitch angle of the SSC300 by adding
small washers or spacers between the mounting bracket holes and mounting surface until
the display reads zero for the pitch angle (skip this step if you are not interested in viewing
the vessel's pitch angle).
3. With the vessel laying flat in the water on a known heading, adjust the heading of the
SSC300 by rotating it until the display reads the known vessel heading.
4. Recheck that the roll and pitch readings are zero and that the indicated heading is correct
(repeat steps 1 through 3 as necessary).
5. Securely fasten the SSC300 by tightening the mounting screws.
3.3 Magnetic Deviation Calibration
Magnetic and/or ferrous items near a magnetic compass such as the SSC300 can cause errors
in the compass' heading output. These errors are referred to as magnetic deviation.
The Maretron SSC300 compass can compensate for heading errors caused by magnetic
deviation by learning about the magnetic environment in which it has been mounted. This is
done using one of four possible magnetic deviation calibration procedures.
1. Maretron Display Product Initiated (Section 3.3.1)
2. Automatically at Power-Up (Section 3.3.2)
Revision 1.0
®
interfaces can perform installation-offset correction through the NMEA
®
Interface (Appendix B)
®
interface (see Appendix B).
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