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A NMEA-0183 Output
178 Trimble R7/R8 GPS Receiver User Guide
Trimble R7 and R8
GSV Satellite Information
The GSV message string identifies the number of SVs in view, the
PRN numbers, elevations, azimuths, and SNR values. An example of
the GSV message string is shown below. Table A.6 describes the
message fields.
$GPGSV,4,1,13,02,02,213,,03,-3,000,,
11,00,121,,14,13,172,05*67
HDT Heading from True North
The HDT string is shown below, and Table A.7 describes the message
fields.
$GPHDT,123.456,T*00
Table A.6 GSV message fields
Field Meaning
1 Total number of messages of this type in this cycle
2 Message number
3 Total number of SVs visible
4 SV PRN number
5 Elevation, in degrees, 90° maximum
6 Azimuth, degrees from True North, 000° to 359°
7 SNR, 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