ADMIRALTY NavPac and Compact Data provides navigators and astronomers with simple and efficient methods for calculating the position of the sun, moon, navigational planets and stars with the aid of a personal computer running Microsoft Windows 8 and 10.
 
It allows navigators to compute their position at sea using traditional celestial navigation techniques combined with modern technology.
 
ADMIRALTY NavPac and Compact Data is used world-wide by the Royal Navy and other navies around the world as well as commercial navigators who use it to provide independent and reliable verification to their on-board Global Navigation Satellite System (GNSS).