For decades, the National Marine Electronics Association (NMEA) has served as the linguistic bridge between disparate devices on boats and vessels—from GPS receivers and autopilots to wind sensors and radar systems. The standard that made this possible is NMEA 0183. While newer standards like NMEA 2000 have gained prominence, NMEA 0183 remains the most widely implemented, cost-effective, and straightforward protocol for serial data communication in the maritime industry.
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-
Enhanced Data Capacity: The 4.11 spec updated GSV (Satellites in View) definitions to provide information for up to 36 satellites per constellation, though some developers noted that GSA (DOP and Active Satellites) remained limited to 12 per constellation in this specific release. The Definitive Guide to NMEA 0183 Version 4
Updated Sentence Formatters: Refined the structure of ASCII "sentences"—the comma-separated strings of text that carry data like position, speed, and time. If you are looking for the historical 0183 v2
In plain English: If you are calculating volume or fuel efficiency, v4.11 requires you to listen for the MTW (Water Temperature) and VHW (Water Speed) sentences simultaneously to correct the depth reading for thermal expansion. Older versions ignored this, leading to 5%+ errors in fish finders.