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SPSx51 Modular GPS Receivers User Guide 123
NMEA-0183 Output A
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. Ta bl e A.4 describes the message fields.
$GPGSV,4,1,13,02,02,213,,03,-3,000,,11,00,121,,14,13,172,05*67
Table A.4 GSV message fields
Field Meaning
0 Message ID $GPGSV
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° through 359°
7 SNR, 00–99 dB (null when not tracking)
8–11 Information about second SV, same format as fields 4 through 7
12–15 Information about third SV, same format as fields 4 through 7
16–19 Information about fourth SV, same format as fields 4 through 7
20 The checksum data, always begins with *