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Figure 175 – Programming SSC200 Rate of Turn Damping Period
6.22.8Rate 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
6.22.9Variation 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,
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