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SSC200 User’s Manual
Page 10 Revision 1.8
This causes the new baud rate to be stored to non-volatile memory, so the compass will retain
this baud rate when it is powered down.
2.4.3 Connecting Both NMEA 2000
®
and NMEA 0183 Interfaces
The SSC200 can be simultaneously connected to both an NMEA 2000
®
network and an NMEA
0183 network.
2.4.4 Checking Connections
Once the NMEA 2000
®
/Power and/or NMEA 0183 connections to the Maretron SSC200 have
been completed, check to see that heading information is being properly transmitted by
observing an appropriate display. Refer to Section 7, “Troubleshooting”, if no heading
information appears, otherwise proceed to Section 3 entitled “Calibration”.
3 Calibration
In order to provide accurate heading indication, the SSC200 must be calibrated in the vessel
after installation. The two calibration procedures that must be carried out are magnetic
deviation calibration (Section 3.1) and installation-offset correction (Section 3.2).
These procedures should be carried out after the initial compass installation and again at any
time that the magnetic environment of the vessel has changed significantly (for example, new
cables have been routed near the compass or new equipment made of ferrous metal has been
installed near the compass).
WARNING: It is imperative that calibration procedures be carried out upon installation
of the SSC200 to ensure accurate readings.
3.1 Magnetic Deviation Calibration
Magnetic and/or ferrous items near a magnetic compass such as the SSC200 can cause
errors in the compass’ heading output. These errors are referred to as magnetic deviation.
The Maretron SSC200 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 3.1.1)
2. Automatically at Power-Up (Section 3.1.2)
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 successive circles during which time the
SSC200 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 SSC200 stores the deviation values in permanent memory for subsequent
compensation. Under certain conditions (e.g., turning to fast or to slow), the SSC200 will not
successfully complete the calibration process and the SSC200 will not store the deviation