This project hosts various plugins for the OpenCPN chart plotter, which are not bundled with the core package.
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.
An integrated set of functions that automate many navigational and tidal calculations which can be time consuming and error prone if performed manually. It can be linked to a GPS to automatically receive position fixes and other information.
Java algorithms to calculate celestial ephemerides, for astronony, and celestialnavigation. Also provides the algorithms for DeadReckoning, like calculation of Estimated Altitude and Azimuth.
...Use Python to calculate the position of Sun, Moon, Planets and Stars with unprecedented precision. PyNOVAS can be used by (Amateur) Astronomers, Sailors and other people interested in CelestialNavigation, Astronomy and Astrometry.