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...OpenCPN is a free software (GPLv2) project to create a concise chart plotter and navigation software, for use underway or as a planning tool. OpenCPN is developed by a team of active sailors using real world conditions for program testing and refinement.
...First goal is a full implemenation of the NMEA 0183 protocol 3.0 (without proprietary extensions).
The library provides parsers for NMEA sentences, gpsd-like network daemons and data generators for simulation and testing.
This allows advanced sensor handling from cellphones/tablets/laptops with GPS up to vehicles/ships with NMEA sensors on board.