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.

This plugin Shows the OpenCPN streams from GPS and AIS ports that propagate
through the plugin interface, NMEA Events and messages flowing
through the plugin API.

Homepage:
https://opencpn.org/OpenCPN/plugins/debugger.html
