5.3 NMEA talker IDs
The NMEA talker identifier serves to define the nature of the data being transmitted. The talker is the first 2
characters after the $ sign within the NMEA sentence. As the LD8 is capable of utilising more than only the GPS
constellation, the talker has a set value for each constellation. For sentences where the data relates to multiple
constellations the ID ‘GN’ will be found.
Not all NMEA sentences will have a variable talker ID (the GGA and ZDA will be fixed with GP) however all other
NMEA messages will have a variable talker.
Note that the talker ID is determined by the constellation/s in use and cannot be changed to another value.
The table below shows the talker IDs and the represented constellation:
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