allows measuring celestial
objects altitudes with your phone,
similar to a marine sextant.
The app uses the phone sensors, camera and GPS.
Point the phone to a celestial object and
capture the altitude and time, necessary
for celestial navigation. You can calibrate the
sextant index, by reading the sea horizon altitude.
Real time on screen celestial objects
(Sun, Moon, 4 planets and 57 navigation stars).
Best way to identify stars and planets.
Practice celestial navigation even without
a marine sextant.
For more information check: