Open source library for working with the National Marine Electronics
Association (NMEA) protocol.

Features:

 * Analysis NMEA sentences and granting GPS data in C structures
 * Generate NMEA sentences
 * Supported sentences: GPGGA, GPGSA, GPGSV, GPRMC, GPVTG
 * Multilevel architecture of algorithms
 * Additional functions of geographical mathematics and work with navigation
   data

WWW: http://nmea.sourceforge.net/