Operation Manual

24 |
Appendix | TP10, TP22 & TP32 User Guide
NMEA sentences received
The NMEA 0183 information required for full functionality of the
TP22 and TP32 whilst in Nav mode is as follows:
- Cross Track Error
- Bearing to destination waypoint
- Arrival at waypoint indication
- Magnetic variation
- Boat speed
This information is extracted from the following NMEA 0183
sentences:
Received Data
APA Cross Track Error, bearing to/arrival at waypoint
APB Cross Track Error, bearing to/arrival at waypoint
RMA Speed & course over ground & magnetic variation
RMB Cross track error, bearing to/arrival at waypoint (T)
RMC Speed & course over ground & magnetic variation
BWR Bearing to/arrival at waypoint (rhumb line)
BWC Bearing to/arrival at waypoint (great circle)
VHW Boat Speed
XTE Cross Track Error
¼ Note: The Cross Track Error (XTE) information has a maximum value
of 1.2 Nautical Miles. If the XTE exceeds this while using Nav mode,
the Tillerpilot will sound an alarm, exit Nav mode and return to
Compass Auto mode.
The Tillerpilot also extracts the apparent wind angle from the
following NMEA 0183 sentences:
Received Data
VWR Apparent Wind Speed & Angle
MWV Apparent Wind Speed & Angle