Simrad GN33, Manual

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GN33 Setup menu Chapter 9-7
Description of NMEA0183 instrument input
WPL Waypoint data (will only be updated every 5 seconds).
TLL Target data (will only be updated every 5 seconds).
MTW Water temperature.
VHW Water speed and heading.
HDT Heading, True.
HDG Heading, Deviation and Variation.
HDM Heading, Magnetic.
VWT True wind speed and angle.
VWR Relative wind speed and angle.
MWV Wind speed and angle.
DBS Depth
below surface.
DBK Depth below keel.
DBT Depth
below transducer.
DPT Depth, including offset.
MTW Water temperature.
Description of NMEA0183 external position, heading and speed
input -
Input is only valid when output is set to NMEA0183.
GLL Geographic position, latitude/longitude.
RMA Recommended minimum specific Loran C data.
RMC Recommended minimum specific GPS data.
GGA Global Positioning System fix data.
VTG Track made good (course) and ground speed.
The external position can be set to OFF, ON, or Dead reckoning
where you can enter a speed value.
When set to ‘Dead reckoning’, the system can function as a Navi-
gation simulator, which can be used for demonstration purpose or
for practicing ‘live’ navigation in ‘off season’. See further details in
Appendix A under ‘Navigation simulator’.