This is a description of how to decode AIVDM/AIVDO sentences. It collects and integrates information from publicly available sources and is intended to assist developers of open-source software for interpreting these messages.

AIS vessel tracking is the mariner's most significant development in navigation safety since the introduction of radar.

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GPS NMEA sentence samples

The tz_world shapefile captures the boundaries of the TZ timezones across the world, as of TZ 2013b. The geometries are all POLYGONs, and a TZ timezone will sometimes have multiple polygons. There are about 28,000 rows.

GeoJSON is a format for encoding a variety of geographic data structures.