Celestial Navigator

Union Designs

About this app

Celestial Navigator is a must have app for mariners and any other person interested in celestial navigation.
It features a rise set and merpass calculator, a line of position and compass error including gyro calculator , a celestial fix calculator (with auto run up and dead reckoning),an almanac of sun,moon,planets and 58 navigational stars.It supports the three most widely used navigational methods for calculation of lines of position i.e. intercept,long by chronometer and latitude by meridian altitude.
It also features a true wind calculator (giving wind speed and direction,dew point and relative humidity),an eta calculator (multiple results are shown at a time depending upon the user settings),a sailing calculator featuring great circle and Mercator sailing calculators along with intermediate point calculator.
It also displays the device's position(lat,long,speed,cog) from the GPS and the compass heading.
The accuracy of the results displayed has been thoroughly tested with the US navy website, the nautical almanac of 2013.The results are with in 10-15 seconds which is accurate enough for sea.
Please read the help carefully.

The app contains can export the almanac data and celestial observations data to the external SD card.

Ratings and reviews

Barely functional. User interface is really rough. Looks like the very first app someone has ever built. Input fields lose values previously entered as you navigate around. Not intuitive. Also the moon phases feature gives completely wrong data for March 2021. Update 12 Aug 2021: Moon phases appear fixed. However the celestial fix DR position form now has a bug where I cannot change the Height of Eye from 20m - no matter what I input for that field it just saves 20m.

Usefull App. Been using since 2013 and never failed me. Funny how many people gives bad review. Stpd people don't understand how to use this, perhaps not real navigators. With good Sextant properly corrected, accuracy of +-0.5nm on LAN and LOP using this app. Someone needs to have a deep knowledge on celestial navigation to maximize the apps benefits. If you are aware of what is the "Holy Grail of Celestial Navigation" before chronometer was used at sea, then this app suits you.

It is good app. It should be added some others facts and diagrams should be more accurate.