Reference Information
LD8 Operations Manual AB-V-MA-00635_RevA2 27
5.2 LD8 OUTPUT SENTENCES
This section outlines the message structure of the following message output types:
5.2.1 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. The table below shows the variable IDs and the represented
constellation:
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