Hello Hashem A. Ghalib,

Most GPS receivers output data like what is shown below at 4800 baud, 8 data bits, no parity 1 stop bit.

The first step in getting this under control is to get a program which will show the data. Hyper terminal from Windows will do this.

Writing a program to capture the data is straight forward. Simply look for the proper characters (i.e., $GPRMC) as they arrive in your data input and when they are recognized just start capturing the data until you see a 0x13 or 0x10 character.

Now you have the data in your buffer and you can start to parse it. Start by looking for the comma character and trimming off the data fields you need.

This might seem overwhelming at first but a step by step process you will have your solution.

Regards,

Charles Bannister

$GPGSA,A,2,16,14,03,,,,,,,,,,1.43,0.82,1.17*09
$GPGSV,3,1,10,03,71,334,31,22,49,029,28,14,44,122,31,19,40,329,00*77
$GPGSV,3,2,10,16,33,199,29,01,23,173,00,18,18,038,00,21,06,077,00*7F
$GPGSV,3,3,10,11,03,290,00,20,02,229,00*79
$GPRMC,193058,A,2117.0755,N,15750.2589,W,0.306,291.8,180407,9.8,E*6C
$PRWIZCH,18,2,16,7,22,2,14,7,00,0,21,2,03,7,19,0,01,0,11,0,20,0,00,0*48
$GPGGA,193059,2117.0753,N,15750.2593,W,1,03,0.82,139.9,M,4.7,M,,*50
$GPGSA,A,2,16,14,03,,,,,,,,,,1.43,0.82,1.17*09
$GPRMC,193059,A,2117.0753,N,15750.2593,W,0.202,351.2,180407,9.8,E*62
$PRWIZCH,18,2,16,7,22,2,14,7,00,0,21,2,03,7,19,0,01,0,11,0,20,0,00,0*48
$GPGGA,193100,2117.0749,N,15750.2598,W,1,03,0.82,139.7,M,4.7,M,,*53
$GPGSA,A,2,16,14,03,,,,,,,,,,1.43,0.82,1.17*09
$GPGSV,3,1,10,03,71,334,31,22,49,029,28,14,44,122,32,19,40,329,00*74
$GPGSV,3,2,10,16,33,199,29,01,23,173,00,18,18,038,00,21,06,077,00*7F
$GPGSV,3,3,10,11,03,290,00,20,02,229,00*79
$GPRMC,193100,A,2117.0749,N,15750.2598,W,0.544,252.6,180407,9.8,E*6C
$PRWIZCH,18,2,16,7,22,2,14,7,00,0,21,2,03,7,19,0,01,0,11,0,20,0,00,0*48
$GPGGA,193101,2117.0745,N,15750.2601,W,1,03,0.82,139.4,M,4.7,M,,*5E
$GPGSA,A,2,16,14,03,,,,,,,,,,1.43,0.82,1.17*09
$GPRMC,193101,A,2117.0745,N,15750.2601,W,0.343,98.4,180407,9.8,E*55
$PRWIZCH,18,2,16,7,22,2,14,7,00,0,21,2,03,7,19,0,01,0,11,0,20,0,00,0*48
$GPGGA,193102,2117.0740,N,15750.2605,W,1,03,0.82,139.2,M,4.7,M,,*5A
$GPGSA,A,2,16,14,03,,,,,,,,,,1.43,0.82,1.17*09
$GPGSV,3,1,10,03,71,334,29,22,49,029,28,14,44,122,31,19,40,329,00*7E
$GPGSV,3,2,10,16,33,199,29,01,23,173,0