Page 20
5.4 NMEA Sentences Received
The NMEA0183 information required for full functionality whilst in Nav Mode is as follows -
Cross track error
Bearing to destination waypoint
Arrival at waypoint indication
Magnetic Variation
This information is extracted from the following NMEA0183 sentences -
NOTE - The Cross Track Error (XTE) information has a maximum value of 1.21 Nautical Miles. If
the XTE exceeds this while using Nav Mode, the Wheelpilot will sound an alarm, exit Nav Mode
and return to Compass Auto Mode.
The TP20 & TP30 also extracts the apparent wind angle from the following NMEA0183 sentences -
VWR Apparent Wind Speed & Angle
MWV Wind Speed & Angle
XTE Cross Track Error and Arrival At Waypoint
BWC Bearing To Destination Waypoint and Arrival At Waypoint (Great Circle)
BWR Bearing To Destination Waypoint and Arrival At Waypoint (Rhumb Line)
APA Cross Track Error, Bearing To Destination Waypoint and Arrival At Waypoint
APB Cross Track Error, Bearing To Destination Waypoint and Arrival At Waypoint
RMA Speed Over Ground (SOG) & Magnetic Variation
RMB Cross Track Error, Bearing To Destination Waypoint and Arrival At Waypoint
RMC Speed Over Ground (SOG) & Magnetic Variation
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