Ratings Score: 4.7402596

Reviews: 39

Updated: 1794269663

Size:

Installs: 100,000+

Current Version:

Required Android Version:

Interactive Elements:

Developer: Maksym Skrypkin

Developer Email:

Developer Address:

Available On: PlayStore

About Nautical Almanac

Nautical Almanac is a celestial navigation app made by a ship's master for fellow deck officers, cadets and yachtsmen. It works fully offline, has no ads, and everything that was free stays free. ★ ALMANAC • GHA, declination, SHA, LHA, computed altitude and azimuth for the Sun, Moon, Venus, Mars, Jupiter, Saturn, Polaris and the 57 navigational stars, for any date, time and position • Semi-diameter and horizontal parallax • Almanac page with all bodies at once, and a sky chart (Sky View) • Magnetic variation with its uncertainty (±) from the World Magnetic Model WMM2025, with warnings near the magnetic poles ★ SIGHT REDUCTION • Enter the sextant altitude and time for each sight; get observed altitude, intercept (toward / away) and azimuth • Every correction shown in sight-form order: index error, dip, refraction (with temperature and pressure), semi-diameter, parallax • Index error, height of eye and watch error are set once per session; Mark stamps the time of a sight • Keep a series of sights and tick the ones to use for a fix ★ POSITION FIX • Star fix or running fix from two to twelve lines of position, from your sights or typed in by hand • Lines advanced to the fix time by course and speed • Least-squares solution with each line's residual, σ and the 95 % error ellipse • Plot like a plotting sheet: lines, azimuth arrows, DR and fix • Warnings for weak geometry and for a sight that does not fit • Save fixes with all their working and share them for the sight book or Training Record Book (stored on your phone, never sent to the developer) ★ COMPASS ERROR • Gyro and magnetic compass error from the azimuth of any body, with variation from the magnetic model ★ RED NIGHT MODE • One tap on the moon icon turns every screen deep red on black and dims the display, to keep your night vision on the bridge ★ SUBSCRIPTION FEATURES • GPS View: live position and time with celestial and compass calculations • GNSS integrity checks: flags position and time jumps, impossible speeds, signal anomalies and lost satellite systems that can point to GPS jamming or spoofing • High-resolution magnetic model WMMHR2025 • Rise, set, transit and twilight times • Live GPS and object selection in Sky View • Online DeltaT updates Nautical Almanac is a calculation, checking and training aid. It does not replace the official Nautical Almanac, approved navigation equipment or the navigator's judgement.