Ok, here's something. I installed a NMEA viewer to see what the SO was getting in a more RAW.
We have 2 basic NMEA sentences, GSV, Sattelites in View, and GGA, fix information. We rarely get this last one. Regarding GSV,
http://www.gpsinform...g/dale/nmea.htm states:
Quote
$GPGSV,2,1,08,01,40,083,46,02,17,308,41,12,07,344,39,14,22,228,45*75
Quote
Where:
GSV Satellites in view
2 Number of sentences for full data
1 sentence 1 of 2
08 Number of satellites in view
01 Satellite PRN number
40 Elevation, degrees
083 Azimuth, degrees
46 SNR - higher is better
for up to 4 satellites per sentence
*75 the checksum data, always begins with *
Now, a sample of a EM770W GPS NMEA sentence:
$GPGSV,2, 1,07,12,60,213,20,31,38,192,,30,06,118,,18,34,253,18*77
Breaking this down:
Number of satellites for full data : 2
Sentence 1 of 2
Number of sattelites in view: 07
Satellite PRN number: 12
Elevation : 60
Azimuth : 213
SNR : 20
Satellite PRN number:31
Elevation : 38
Azimuth : 192
SNR : Missing
Satellite PRN number: 30
Elevation : 06
Azimuth : 118
SNR : Missing
Satellite PRN number: 18
Elevation : 34
Azimuth : 253
SNR : 18
There was a second GSV sentence as stated by the first 2, but it's unimportante now.
I also had a GGA when this snapshot was taken, but it's very rare. Most of the time, we get ALOT of missing SNRs... i don't know why...