Hi Guys,
A quick example on what $GPGSV messages are. Keep in mind that the sentence Identifier can also be displayed as $GNGSV. The message is the same but some GNSS receivers use this format.
$GPGSV
GPS Satellites in view
eg. $GPGSV,3,1,11,03,03,111,00,04,15,270,00,06,01,010,00,13,06,292,0074
$GPGSV,3,2,11,14,25,170,00,16,57,208,39,18,67,296,40,19,40,246,0074
$GPGSV,3,3,11,22,42,067,42,24,14,311,43,27,05,244,00,*4D
$GPGSV,1,1,13,02,02,213,,03,-3,000,,11,00,121,,14,13,172,05*67
1 = Total number of messages of this type in this cycle
2 = Message number
3 = Total number of SVs in view
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 as field 4-7
12-15= Information about third SV, same as field 4-7
16-19= Information about fourth SV, same as field 4-7