User's Manual

Trimble R7/R8 GPS Receiver User Guide 171
NMEA-0183 Output A
Trimble R7/R8 GPS Receiver Operation
HDT Heading from True North
The HDT string is shown below, and Table A.7 describes the message
fields.
$GPHDT,123.456,T*00
4 SV PRN number
5 Elevation, in degrees, 90° maximum
6 Azimuth, degrees from True North, 000° to 359°
7SNR, 00
–99 dB (null when not tracking)
8
–11 Information about second SV, same format as fields 4–7
12
–15 Information about third SV, same format as fields 4–7
16
–19 Information about fourth SV, same format as fields 4–7
Table A.7 Heading from true north fields
Field Meaning
1 Heading in degrees
2 T: Indicates heading relative to True North
Table A.6 GSV message fields (continued)
Field Meaning