: The first two characters identify the talker ID (e.g., GP for GPS, GA for Galileo, AI for AIS). XXX : The sentence formatter (e.g., GGA, RMC, VHW). Comma : Field delimiter. *hh : Checksum, ensuring data integrity. : End of message. Critical Sentence Updates in 4.11 Version 4.11 refined sentences such as:
Version 4.11 (released November 2018) is a proprietary standard that defines the electrical requirements and data transmission protocols for marine electronics. While the official full specification PDF must be purchased from the National Marine Electronics Association (NMEA)
If you need help implementing this protocol, please let me know: