Revision 1.4.16a Page 161
Figure 175 – Programming SSC200 Rate of Turn Damping Period
6.22.8 Rate of Turn Zero Offset Calibration
The DSM250 is capable of displaying rate of turn information from a Maretron SSC200 compass.
Although the compass provides very accurate rate of turn information, it can drift off of zero even
though the vessel is not turning. Fortunately, the SSC200 can learn the zero offset for different
conditions found on the vessel. You teach the compass these zero offset values by pressing the
Enter key ( ) with the “Rate of Turn Zero Offset Calibration…” menu item selected which causes
the DSM250 to display the screen shown in Figure 176. The Rate of Turn Offset Calibration should
be done before the Deviation Calibration (section 6.22.5).
Figure 176 – SSC200 Rate of Turn Zero Offset Calibration Screen
6.22.9 Variation Source Entry
The SSC200, being a magnetic compass, transmits heading information referenced to the magnetic
north pole (magnetic heading). The SSC200 is capable of transmitting heading information
referenced to the earth’s geographic North Pole (true heading). In order to produce true heading,
