Trimble R6/R7 GPS and Trimble R8 GNSS Receivers User Guide 131
NMEA-0183 Output A
Trimble R6 and R7 GPS/R8 GNSS Receiver Operation
HDT Heading from True North
The HDT string is shown below, and Tab le A. 6 describes the message fields.
$GPHDT,123.456,T*00
PTNL,GGK
Time, Position, Position Type, DOP
An example of the PTNL,GGK message string is shown below. Table A.7 describes the
message fields.
$PTNL,GGK,172814.00,071296,
3723.46587704,N,12202.26957864,W,
3,06,1.7,EHT-6.777,M*48
Note – The PTNL,GGK message is longer than the NMEA-0183 standard of 80 characters.
Table A.6 Heading from true north fields
Field Meaning
1 Heading in degrees
2 T: Indicates heading relative to True North
Table A.7 PTNL,GGK message fields
Field Meaning
1 UTC of position fix
2Date
3Latitude
4 Direction of latitude:
5 Longitude
6 Direction of Longitude:
7 GPS Quality indicator:
Differential, code phase only solution (DGPS)
8 Number of satellites in fix
9DOP of fix
10 Ellipsoidal height of fix
11
M: ellipsoidal height is measured in meters
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