Raymarine Autohelm 100, Install Manual

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Chapter 6: Track Control
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Chapter 6: Track Control
Track control allows the autopilot to maintain track between waypoints
entered on a GPS, Decca or Loran Navigation System. The navigation
system must have a suitable autopilot NMEA output (refer to section 2.13).
If the navigation system transmits the correct NMEA 0183 sentences, the
autopilot will receive and display bearing to waypoint, distance to
waypoint, waypoint number and cross track error.
If it transmits NMEA 0180 only crosstrack error will be displayed.
Before attempting sea trials, make sure that the control unit is receiving
navigation data by using the Display key to bring it up on the control
unit LCD.
Note:
If data is not being received it is impossible to select Track Mode.