Validate IMO numbers using the official checksum (or generate valid ones) with batch mode.
Your vote is saved on this device only.
Decode AIS NMEA sentences (Types 1β3 position reports and Type 5 voyage data) at the bit level.
Build a valid AIS Type 1 position report from form inputs with step-by-step encoding.
Auto-detect and decode 17+ NMEA 0183 sentence types with checksum validation.