Revision 1.8.3
Page 167
Figure 178
– Programming SSC200/SSC300 Rate of Turn Damping Period
6.23.8
Rate of Turn Zero Offset Calibration
The DSM570 is capable of displaying rate of turn information from a Maretron SSC200/SSC300
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/SSC300 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 DSM570 to display the screen shown in Figure 179. The Rate of Turn Offset Calibration
should be done before the Deviation Calibration (Section 6.23.5).
Figure 179
– SSC200/SSC300 Rate of Turn Zero Offset Calibration Screen
6.23.9
Variation Source Entry
The SSC200/SSC300, being a magnetic compass, transmits heading information referenced to the
magnetic north pole (magnetic heading). The SSC200/SSC300 is capable of transmitting heading
information referenced to the earth’s geographic North Pole (true heading). In order to produce true
heading, information regarding the magnetic variation at the current location is required. Please see
