If designing a gateway between NMEA 0183 and NMEA 2000, you need exact field mappings. The PDF ensures no data loss during conversion.
First, a reality check. NMEA 0183 is not a software library. It is an electrical and data protocol standard. The latest official release is Version 4.11 (sometimes referred to as v4.10 plus errata).
If you are looking for the historical 0183 v2.3 (the one with the $GPGGA sentence), you are dealing with a 20-year-old standard. Version 4.11 introduces massive changes to baud rates, talker IDs, and data integrity. Nmea 0183 Version 4.11 Pdf-
Do not confuse this with NMEA 2000. 0183 is serial (RS-422/RS-232). 2000 is CAN. 4.11 makes 0183 behave more like 2000 in terms of data richness, but it is still electrically serial.
If you are building a product that claims NMEA 0183 compliance, you must reference the official standard. Reverse-engineering from online examples does not constitute compliance and exposes you to liability. If designing a gateway between NMEA 0183 and
Legacy: N = Null.
v4.11: V = Void (sensor powered but no lock). N = Not available (sensor offline).
If you treat V as N, you will log false "Sensor Offline" errors for a receiver that is simply searching for satellites.
Only by following the verbatim specification can you be certain that your device will work with other certified devices from brands like Garmin, Raymarine, Furuno, and Simrad. First, a reality check
If you are writing a parser for v4.11 based on a PDF you found online, watch out for:
v4.11 allows consecutive commas to denote missing data.
Example: $GPGGA,123519,,,,,,, ...
Old parsers crashed. v4.11 parsers must handle this without reallocating memory.
