nmea_degrees
if (nmea_degrees(&np->latitude.value, fld[3], *fld[4] == 'S' ? 1 : 0))
if (nmea_degrees(&np->longitude.value,fld[5], *fld[6] == 'W' ? 1 : 0))
int nmea_degrees(int64_t *dst, char *src, int neg);