← All tools

NMEA 0183 Sentence Parser

Paste a receiver log to verify its checksums and read the position, time, satellite, speed and course fields.

one sentence per line · GGA, RMC, GLL, GSA, GSV and VTG are decoded; other standard addresses are split into fields · Ctrl+Enter parses

The checksum is the XOR of the ASCII characters between $ (or !) and *. It detects accidental changes, not spoofing, and a valid checksum does not prove that a position or fix is accurate. RMC two-digit years use the conventional 1973 pivot. Parsing is local: no receiver is opened and no data is stored or sent anywhere.