Calculate precise celestial positions for navigation from 1900 to 2050. Get real-time data on the Sun, Moon, planets, and stars, including rise/set times and atmospheric corrections.
Perpetual Nautical Almanac by RPA Technologies






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Calculate precise celestial positions for navigation from 1900 to 2050. Get real-time data on the Sun, Moon, planets, and stars, including rise/set times and atmospheric corrections.




This navigation tool calculates magnetic variation, the difference between true and magnetic north, essential for plotting courses on maps. It's designed for pilots, sailors, cartographers, and anyone using maps and a compass.






This navigation app provides real-time course, speed, and position data on a clear display. It offers turn-by-turn navigation with voice prompts, map overlays, and the ability to save tracks and points of interest. Additional features include sunrise/sunset times, horizon distance calculation, and specialized functions for sailing and geocaching.