If you are writing a parser for v4.11 based on a PDF you found online, watch out for:
NMEA 0183 is a serial communication protocol that uses printable . NMEA 0183 vs 2000: What's the difference? - Trawler Forum Nmea 0183 Version 4.11 Pdf-
One of the largest sources of data corruption in older systems was improper or missing checksums. Version 4.11 mandates the NMEA checksum ( *HH ) and provides precise calculation examples, making it easier for developers to debug. If you are writing a parser for v4