# Navigation Almanac — Celestial navigation offline

> Offline celestial navigation toolkit for calculating celestial body data and positions. (iPhone/iPad app by Vladyslav Zenchenko.)

- Source: https://appshunter.io/ios/app/navigation-almanac/id6777455516 (this page in markdown: same URL + `.md`)
- Developer: [Vladyslav Zenchenko](https://appshunter.io/developer/6777455518)
- Category: Navigation, Reference
- Price: Free
- Rating: 5.00/5 from 2 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 3 MB
- Languages: American English, Danish, Dutch, French (France), German (Germany), Greek, Italian, Latvian, Polish, European Portuguese and 6 more
- Released: 2026-06-16
- Data updated: 2026-09-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/navigation-almanac/id6777455516/reviews.md

## What is Navigation Almanac?

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.

Navigation Almanac is a computational aid. Carry the official almanac and tables required for your voyage.

## Key features

- 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

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/navigation-almanac/id6777455516/reviews.md

### 5/5 — Excellent App – A Few Suggestions for GPS & Compass Correction

*2026-08-20*

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!

## Frequently asked questions about Navigation Almanac

### 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.

## Version history (last 4 releases)

### 1.2 — 2026-08-25

• 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.

### 1.0.2 — 2026-08-22

You can now fill your position from GPS in Compass Correction. Accuracy improvements and bug fixes.

### 1.0.1 — 2026-08-20

Bug fixes and stability improvements.

### 1.0 — 2026-06-16

No release notes.

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## More apps by Vladyslav Zenchenko

- [PaperBall: Draw & Roll](https://appshunter.io/ios/app/paperball-draw-and-roll/id6780953543)

All apps by Vladyslav Zenchenko: https://appshunter.io/developer/6777455518

## Related topics

[the wanderers' almanac](https://appshunter.io/ios/topics/the-wanderers-almanac) · [almanac nautical](https://appshunter.io/ios/topics/almanac-nautical) · [polestar parallax](https://appshunter.io/ios/topics/polestar-parallax)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-01.*