Nautical almanac – calculates azimuth, height and other celestial almanac information for Sun and Moon, primary navigation stars and navigation planets: Venus, Mars, Jupiter, Saturn.
In addition, for magnetic compass error calculation, finds Variation (Mag. Declination) for given positon. Calculation of variation is based on the latest World Magnetic Model (WMM2015)
Gyro and magnetic compass error calculator added from ver. 1.05

Note about permissions:
VENDING: For the in app billing in case you wish to donate or activate GPS option