Navigation Almanac

Navigation Almanac

Celestial navigation offline

2 ratings
1 review
Free

Details

  • Released
  • Updated
  • June 16, 2026
  • August 25, 2026

Features

Navigation Almanac screenshot #1 for iPhone
Navigation Almanac screenshot #2 for iPhone
Navigation Almanac screenshot #3 for iPhone
Navigation Almanac screenshot #4 for iPhone
Navigation Almanac screenshot #5 for iPhone
iphone
ipad
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About

This app provides a comprehensive offline celestial navigation toolkit. It calculates celestial body positions, sunrise/set times, and sky charts. It also offers tools for compass error correction and position fixing, all without requiring an internet connection.

Offline celestial almanac data
Sight reduction calculations
Rise, set, and twilight times
Sky view chart and dome
Live GPS position and course
Compass error correction
Fix calculator
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What's New in Navigation Almanac

1.2

August 25, 2026

• Fourteen new languages: Ukrainian, French, Spanish, Italian, Portuguese, German, Dutch, Polish, Swedish, Danish, Greek, Turkish, Latvian and Simplified Chinese. The navigation terms in each follow that country's own nautical almanac rather than a literal translation. • Sky View draws the GNSS satellites predicted above your horizon from a bundled orbital catalogue, refreshable from Settings. • GPS view counts the satellites in view for each constellation. • Compass Error can fill the observer position from GPS. • Redrawn Sky View with background stars and constellation lines. • Accuracy and stability fixes in rise/set, the fix calculator and angle formatting.

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User reviews

Excellent App – A Few Suggestions for GPS & Compass Correction

Dear Support Team,

It would be great to expand the GPS section with more satellite information — for example, which satellite systems are currently being received and how many satellites are currently in use.

A sky-view feature showing the satellites above the observer, ideally with their tracks or trajectories, would also be very useful. A similar feature existed in another app that was later removed from the App Store.

In the Compass Correction section, it would also be helpful to have an option to automatically use the phone’s current GPS coordinates, while still keeping manual coordinate input available.

Thank you for your work and for continuing to improve the app.

Best regards
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Response from developer

Thank you for the detailed suggestions! GPS coordinates auto-fill in Compass Correction is coming in the next update. We are also looking into a satellite sky view. Thank you for using Navigation Almanac!

Developer apps

FAQ

What celestial bodies can Navigation Almanac calculate data for?

Navigation Almanac can calculate data for the Sun, Moon, Venus, Mars, Jupiter, and Saturn, along with the 57 navigational stars. This includes their azimuth, altitude, hour angles, and declination for any chosen moment.

Does Navigation Almanac require an internet connection to work?

No, Navigation Almanac works entirely offline. All ephemerides are computed on the device, allowing you to use it even when in airplane mode or weeks from shore.

What languages does Navigation Almanac support?

Navigation Almanac supports sixteen languages, including English, Russian, French, Spanish, German, and Simplified Chinese. The terminology used in each language is sourced from that country's own nautical almanac and textbooks.

How does Navigation Almanac handle compass error correction?

Navigation Almanac can solve gyro and magnetic compass error from an observed bearing. It keeps variation and deviation separate, mirroring how corrections are applied on a ship's bridge.

Can I use Navigation Almanac to determine my position?

Yes, Navigation Almanac includes a fix calculator. You can cross two lines of position from your reductions and advance the first line for the vessel's run to read off your observed position.

What is the age rating for Navigation Almanac?

Navigation Almanac has an age rating of 4+, making it suitable for a wide range of users.

How often is Navigation Almanac updated?

The latest version, 1.2, was released on August 25, 2026, indicating recent development activity. The app is updated to ensure accurate celestial data and features.

Is Navigation Almanac available on Android devices?

Currently, Navigation Almanac is available for iPhone and iPad. There is no information provided about Android support at this time.