https://toorun.dev/tags/parsing/Recent content in parsing on toorun.devHugo -- gohugo.ioen-usFri, 24 Jul 2026 11:00:00 +0000https://toorun.dev/posts/nmea0183-practical-guide-sentence-format-checksum-parser-examples/Fri, 24 Jul 2026 11:00:00 +0000https://toorun.dev/posts/nmea0183-practical-guide-sentence-format-checksum-parser-examples/NMEA 0183 Practical Guide NMEA 0183 is a text protocol used by GNSS/GPS modules, marine devices, and many embedded products. It is simple, stable, and still common in production systems. If you work with UART logs from a GPS module, this is the format you will usually see. 1) NMEA 0183 sentence pattern A standard sentence looks like: $GPRMC,093000.00,A,5231.1234,N,01324.5678,E,2.1,84.4,240726,,,A*6C Pattern: $ttsss,data1,data2,...*hh $ starts the sentence tt is talker ID (GP, GN, GL, GA, …) sss is sentence type (RMC, GGA, GSA, GSV, VTG, …) , separates fields *hh is checksum in hex (XOR of bytes between $ and *) 2) Talker IDs you will see GP: GPS GL: GLONASS GA: Galileo GB: BeiDou GN: combined multi-GNSS output In modern modules, GN is common.