CelNav 360

Computed horizon, almanac and intercepts plot for offline celestial navigation

Features a realtime panoramic view of the horizon specifically tailored to celestial navigational ends, i.e.., star/planet identification, sight preparation, true bearings etc.. Enter measured altitudes using the sight log. Lines of position (intercept method) and their associated fix ellipse (1-sigma) are shown on a pan/zoom grid centred on Assumed Position.

Almanac and sight reduction functionality cover the standard complement of navigational stars; extendable to the sun, moon, and planets as an in-app upgrade.

Allow up to 1-2 nautical miles for the program's inherent ephemerides-related error. Additionally, note that it is not uncommon for Android devices to be a couple of seconds out of sync with UT (Universal Time). Allow 1 nautical mile for every 4 secs of system clock error,