Celestial navigation exploits the principle that every measurement taken with a sextant (a 'sight') converts to a line of position on a chart, the intersections of two or more such lines providing a position fix. Use this offline compatible app to plan/enter sights and inspect the resulting lines of position. Features - * The 58 navigational stars of the Nautical Almanac. * Realtime computed horizon in panoramic projection. Use for star/planet identification, sight preparation, true bearings etc. * Sight reduction, ephemerides calculated internally * Lines of position plotted on a pan/zoom grid centered on Assumed Position (intercept method) * Import sights from companion app Angular Distance (uses camera as sextant) * Rising/setting almanac * Lunar distances conversion to Universal Time Premium Subscription - All features extended to the sun, moon and planets