title: Gps nmea output getting valid $GPGSV but not valid $GPGGA $GPRMC
body: <p>I'm trying to parse gps nmea output from a modem connected to serial port of a cubietruck board (ARM® Cortex™-A7 Dual-Core). The configuration is done succesfully I get 4g network form modem but when I try to see nmea outout of the gps module, I get the following :  </p>
  
  <pre><code>$GPRMC,,V,,,,,,,,,,N*53
  $GPGSV,2,1,08,07,49.9,43.6,28.2,28,49.9,158.9,29.2,02,3.5,239.1,,05,49.9,286.9,E
  $GPGSV,2,2,08,06,,,,08,9.8,68.9,,09,31.6,104.1,,13,20.4,299.5,,1*5E
  $GNGNS,112218.9,,,,,NNN,,,,,,*03
  $GPVTG,,T,,M,,N,,K,N*2C
  $GPGSA,A,1,,,,,,,,,,,,,,,*1E
  $GNGSA,A,1,,,,,,,,,,,,,,,*00
  $GPGGA,,,,,,0,,,,,,,,*66
  $GPRMC,,V,,,,,,,,,,N*53
  $GPGSV,2,1,08,07,49.9,43.6,27.9,28,49.9,158.9,29.7,02,3.5,239.1,,05,49.9,286.9,F
  $GPGSV,2,2,08,06,,,,08,9.8,68.9,,09,31.6,104.1,,13,20.4,299.5,,1*5E
  $GNGNS,112219.9,,,,,NNN,,,,,,*02
  </code></pre>
  
  <p>Looking in <a href="http://aprs.gids.nl/nmea/" rel="nofollow noreferrer">http://aprs.gids.nl/nmea/</a> I found that $GPGSV is GPS Satellites in view. So what I understand is that I get 2 satellites. Is this perhaps the case that I don't get valid $GPGGA $GPRMC or should I check something else?</p>