36 lines
1.2 KiB
Markdown
36 lines
1.2 KiB
Markdown
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# Garmin Proprietary messages
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To use the Garmin Proprietary NMEA message parser, you must enable the following in `NMEAGPS_cfg.h`:
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```
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#define NMEAGPS_PARSE_MFR_ID
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#define NMEAGPS_DERIVED_TYPES
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```
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**NeoGPS** implements the following additional NMEA messages:
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* $PGRMF - Fix data
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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:
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```
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#define GARMINGPS_PARSE_PGRMF
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```
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As shown in the PGRM.ino example program, you should use an instance of `GarminNMEA` instead of the typical `NMEAGPS`:
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```
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#include <NeoGPS_cfg.h>
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#include <Garmin/GrmNMEA.h>
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#include <GPSTime.h>
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...
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static GarminNMEA gps; // This parses received characters
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static gps_fix fix;
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```
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A few different header files are included, but all other operations are identical.
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Notice that the $PGRMF message sets the global variable, `GPSTime::leap_seconds`. As reported in
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[Issue #90](https://github.com/SlashDevin/NeoGPS/issues/90), this is required for exact UTC
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calculations that span dates with different GPS leap seconds
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(see [Wikipedia article](http://en.wikipedia.org/wiki/Global_Positioning_System#Leap_seconds)).
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