GPS NMEA Lib

hi guys

i trying use nmea lib found here  

http://www.maartenlamers.com/nmea/nmea.html


i can working alright feeding gps straight serial in decode wondering possible feed data in decode string instead of directly serial.  

here piece of code have tried, c string gprmc sentence stored in it:

code: [select]

   

    (int i=0; i<70 ; i++) {
     
    if (gps.decode(c[i])) {
      if (gps.gprmc_status() == 'a') {
        if (gps.gprmc_distance_to(dest_latitude, dest_longitude, mtr) < 500.0) {
         serial.println("zomg");
       }
       else {
       serial.println("zgomg");
       }
     }
   }
 }
 

now have no idea if possible or close should doing    but code above output nothing yet same code serial fed in directly work.

any ideas ?

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