To use the Garmin Proprietary NMEA message parser, you must enable the following in NMEAGPS_cfg.h:
#define NMEAGPS_PARSE_MFR_ID
#define NMEAGPS_DERIVED_TYPES
NeoGPS implements the following additional NMEA messages:
- $PGRMF - Fix data
You may want to change the configured PGRM messages in src/Garmin/PGRM_cfg.h. It is currently configured to work with the example application, PGRM.ino. PGRM_cfg.h has the following configuration items:
#define GARMINGPS_PARSE_PGRMF
As shown in the PGRM.ino example program, you should use an instance of GarminNMEA instead of the typical NMEAGPS:
#include <NeoGPS_cfg.h>
#include <Garmin/GrmNMEA.h>
#include <GPSTime.h>
...
static GarminNMEA gps; // This parses received characters
static gps_fix fix;
A few different header files are included, but all other operations are identical.
Notice that the $PGRMF message sets the global variable, GPSTime::leap_seconds. As reported in
Issue #90, this is required for exact UTC
calculations that span dates with different GPS leap seconds
(see Wikipedia article).