NMEA-GP-VTG

Description:

Standard NMEA: Course over ground and ground speed.

This message is actually NMEA-GN-VTG, as it uses information from all GNSS constellations (GN), not GPS only (GP). However, we publish it as NMEA-GP-VTG to maximize compatibility.

Configuration:

• NMEA-GP-VTG_GNSS for combined (average) output from both receivers

  • The course over ground and speed over ground are computed from the average position and velocity between GNSS1 and GNSS2. Note that this is not the same as the average of the individual COG and SOG.

  • The positioning mode is from the “best” receiver

• NMEA-GP-VTG_GNSS1 for output from GNSS 1 receiver

  • This is the standard NMEA VTG for GNSS1.

• NMEA-GP-VTG_GNSS2 for output from GNSS 2 receiver

  • This is the standard NMEA VTG for GNSS2.

• NMEA-GP-VTG_FUSION for output from Fusion

  • The course over ground and speed over ground are from fusion.

  • The positioning mode is from the “best” receiver

Notes:

• These messages does not contain any information that would let one tell them apart. Do not enable more than one of these in the same port.

• This message is according to NMEA 0183 v4.11 (and erratas).

• It uses the “GP” talker ID even though the navigation solution is multi-GNSS.

Example message:

$GPVTG,0.0,T,,M,0.0,N,0.0,K,D*08\r\n

Example message with non-standard high-precision fields:

$GPVTG,0.0000,T,,M,0.01316,N,0.02437,K,D*3F\r\n

Message fields: