#ifndef __GPS_SENTENCE_H__#define __GPS_SENTENCE_H__typedef enum {  UNKNOWN = 0,  GPBOD, /* Bearing, Origin, Destination */  GPBWC, /* Bearing and distance to waypint, great circle */  GPGGA, /* GPS Fix Data */  GPGLL, /* Geographic Position, Longitude, Latitude */  GPGSA, /* GPS DOP and active satellites */  GPGSV, /* GPS Satellites in view */  GPHDT, /* Heading, True */  GPR00, /* list of waypoints in currently active route */  GPRMA, /* recommended minimum specific Loran-C data */  GPRMB, /* recommended minimum navigation info */  GPRMC, /* recommended minimum specific GPS/Transit data */  GPRTE, /* Routes */  GPTRF, /* Transit Fix Data */  GPSTN, /* Multiple Data Id */  GPVBW, /* Dual Ground / Water Speed */  GPVTG, /* track made good and ground speed */  GPWPL, /* waypoint location */  GPXTE, /* cross-track error, measured */  GPZDA, /* Date & Time */  N_SENTENCES} gps_sentence;#endif