Paste one or more sentences to decode them.
Auto-detect and decode 17+ NMEA 0183 sentence types with checksum validation.
Paste one or more sentences to decode them.
Your vote is saved on this device only.
The NMEA 0183 Sentence Parser reads raw NMEA 0183 data and decodes it into clear, labeled fields. Paste a single sentence or a full log, and the tool auto-detects the sentence type, breaks out each value, and validates the checksum so you can immediately spot corrupted or malformed messages from a GPS receiver, AIS unit, or other marine instrument. It recognizes 17+ common sentence types without you having to specify the format first.
It is built for boat owners, marine electronics installers, chartplotter integrators, and developers working with NMEA data streams. Instead of decoding fields by hand against the spec, you get an instant breakdown. The tool is completely free and runs entirely in your browser, so your navigation logs and position data are parsed locally and never uploaded to any server.
No. The parser runs entirely client-side in your browser, so your sentences, position data, and logs are decoded on your device and never sent to a server.
The tool recognizes 17+ common sentence types and auto-detects which one you have pasted, so you do not need to identify the format beforehand.
It recomputes the checksum from the sentence body and compares it to the value after the asterisk. A mismatch means the sentence was corrupted in transit or edited incorrectly.
Yes. You can paste a whole log of sentences, and each line is detected, decoded, and checksum-validated independently.
No, the NMEA 0183 Sentence Parser is completely free with no account or installation required.