Furuno FAR-3210 Operator's Manual page 420

23. COMMON REFERENCE SYSTEM
• If synchro or stepper gyro data is fed to the chart radar, the heading indication
on the chart radar must be adjusted to match that of the gyro. For the adjustment
procedure, see section 1.15.
Speed data:
• Speed may be input from SDME or GPS.
• SDME may be single-axis water speed or dual-axis ground speed.
• GPS may be used to input COG/SOG.
• Ground speed may also be taken from TT reference target.
• Speed is entered from the [Setting] menu. For details, see section 1.14.
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