Navigation Almanac

Name: Navigation Almanac
Rating: 5 (2 reviews)
Author: Vladyslav Zenchenko

Celestial navigation offline

Free · Designed for iPad. Not verified for macOS.

2 Ratings
Age Rating

4+
Years
Category

Navigation
Developer

Vladyslav Zenchenko
Language

EN
+ 15 More
Size

3.8
MB

Navigational warnings from twelve national coordinators, grouped by country and by NAVAREA, with the full text of every message. Experimental, and it says so. Navigation Almanac is a complete celestial-navigation toolkit for iPhone and iPad. It reduces a sight, tabulates the almanac data you would otherwise look up on paper, and works entirely offline - no signal, no subscription, no account. SIGHT REDUCTION Enter your position and the date and time in UTC or local time, then pick a body. You get azimuth and computed altitude, GHA, LHA, SHA and declination, semi-diameter and horizontal parallax, along with the magnetic variation from the WMM-2025 model and the current value of ΔT. ALMANAC The Sun, Moon, Venus, Mars, Jupiter and Saturn together with the 57 navigational stars, each with azimuth, altitude, hour angles and declination for the moment you have chosen. RISE, SET AND TWILIGHT Rise, meridian transit and set for any body, with civil and nautical twilight at the Sun's standard altitudes (-0°50′ / -6° / -12°), shown in UTC or local time. SKY VIEW The sky drawn as a chart of azimuth against altitude, or as a full-sky dome with the zenith at the centre. Background stars, constellation lines, and a predicted GNSS satellite layer computed from a bundled orbital catalogue. GPS Live position, course and speed over ground, altitude and horizontal accuracy, the magnetic variation at your position, and the ephemeris of the selected body. One tap fills the observer position for a reduction. COMPASS ERROR Solve gyro and magnetic compass error from an observed bearing, with variation and deviation kept separate, the way the correction is actually applied on the bridge. FIX CALCULATOR Cross two lines of position from your reductions, advance the first line for the vessel's run between sights, and read off the observed position. WORKS OFFLINE The ephemerides are computed on the device from the VSOP87 and ELP2000 series with IAU 1980 nutation - they are not downloaded. Everything above works with the phone in airplane mode, weeks from shore. SIXTEEN LANGUAGES English, Russian, Ukrainian, French, Spanish, Italian, Portuguese, German, Dutch, Polish, Swedish, Danish, Greek, Turkish, Latvian and Simplified Chinese. The navigation terminology in each was taken from that country's own nautical almanac and navigation textbooks rather than translated word for word. NAVIGATIONAL WARNINGS Warnings in force from the national coordinators of the worldwide navigational warning service, grouped by country and by NAVAREA, with the full text of every message and the positions read out of it. The feed is rebuilt every hour and the last copy stays on the device, so it is there when the signal is not. This is an experimental feature and the screen says so: the data is gathered automatically, it can lag behind the broadcast, and it can be incomplete. It does not relieve you of the requirement to receive Maritime Safety Information over NAVTEX and SafetyNET as provided for by SOLAS. Navigation Almanac is a computational aid. Carry the official almanac and tables required for your voyage.

Ratings & Reviews

5.0

out of 5

2 Ratings

Excellent App – A Few Suggestions for GPS & Compass Correction
Aug 20
Nikolenko Stanislav
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

Developer Response
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!
Excellent App – A Few Suggestions for GPS & Compass Correction
Aug 20
Nikolenko Stanislav

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
Developer Response Aug 21
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!

The navigational warnings screen could not be opened past its first page. Tapping a warning, a coordinator or the list of recent warnings did nothing at all. Fixed, and covered by tests that tap rather than look.

Version 1.4.1 Sep 25

Data Not Collected

The developer does not collect any data from this app.

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Accessibility

Information

Seller: Vladyslav Zenchenko
Size: 3.8 MB
Category: Navigation
Compatibility: Requires iOS 17.0 or later.

iPhone
Requires iOS 17.0 or later.

iPad
Requires iPadOS 17.0 or later.

Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.

Apple Vision
Requires visionOS 1.0 or later.
Languages: English and 15 more

English, Danish, Dutch, French, German, Greek, Italian, Latvian, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Turkish, Ukrainian
Age Rating: 4+

4+

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