The classic GGA (Global Positioning System Fix Data) remains. However, v4.11 introduces (it was optional in v1.5) and new fields for:
It introduced new identifiers to distinguish between different data sources, such as specific satellite receivers or safety systems like bilge controllers ('BI') and watertight doors ('WD'). Nmea 0183 Version 4.11 Pdf-
Single-talker, multi-listener unidirectional serial communication. The classic GGA (Global Positioning System Fix Data) remains
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. Nmea 0183 Version 4.11 Pdf-
character and concludes with a two-digit hexadecimal checksum to verify data accuracy. Updated Identifiers