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21. Common Reference System
21-2
• Gyro data
• A gyrocompass is interfaced with the radar processor, however gyro data is fed to the chart processor via
LAN.
• Gyro data may be IEC 61162-2 serial data, or synchro or stepper signal fed through Gyro Converter GC-10.
• Serial format gyro data is fed directly from a gyrocompass, thus adjustment of the heading indication on the
chart radar is not necessary.
• 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 2.3.
• 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 SENSORS dialog box. For details, see section 2.5 How to Input Your Ship's
Speed.