# EZ Celestial Navigation — ezAlmanacOne

> App for celestial navigation calculations and position fixing at sea. (iPhone/iPad app by EZ Celestial LLC.)

- Source: https://appshunter.io/ios/app/ez-celestial-navigation/id1547239240 (this page in markdown: same URL + `.md`)
- Developer: [EZ Celestial LLC](https://appshunter.io/developer/504153123)
- Category: Navigation, Education
- Price: $29.99
- Rating: 4.90/5 from 26 App Store ratings · 4 written reviews indexed
- Age rating: +4
- Requires: iOS 13.0 · 153 MB
- Released: 2021-03-03
- Data updated: 2026-09-06
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ez-celestial-navigation/id1547239240/reviews.md

## What is EZ Celestial Navigation?

Celestial navigation has never been easier!  With ezAlmanacOne and a sextant you will be finding your fix like a pro in no time!

ezAlmanacOne is an evolution of the iPad version of ezAlmanac with the modern user interface used in the Windows 10 version of ezAlmanac.  All of the features of ezAlmanac plus new features including:

- Universal app runs on iPad, iPhone, iPod touch, and the new MacBook with M1 processor.
- Supports all device orientations.  All screens support zoom and pan.
- Make bearing observations to perform compass checks.
- Archive saved observations and restore observation data from an archive.
- Includes quick start guide, usage examples, and other documentation to learn celestial navigation.
- Print/Output Nautical Almanac pages, observation reports, and other app documentation.

ezAlmanacOne will help you perform celestial navigation exactly as it has been done for hundreds of years. It produces all Nautical Almanac (1960-2059) and Pub. 229 tables exactly as you are used to seeing them in the printed form.  All tables can be accessed directly for manual usage if you choose to do so.  Since they are produced by the software they support zooming and panning, and you can highlight in the tables to easily find the correct value to use.

Most users, however, will prefer to let ezAlmanacOne do all of the work.  Simply enter the basic sight parameters, make and enter your observations, and ezAlmanacOne will do the rest.  It performs all of the steps to correct your observation, find GP of the object, do the sight reduction, and plot the LOP.  No steps are skipped and all details are shown.  Click where the LOPs cross in the plot and you have found your fix!

Besides finding your fix, ezAlmanacOne is one of the best tools available to perform compass checks from a bearing observation of one of the navigational bodies. The compass check function supports checking up to 5 devices from a single bearing observation.  ezAlmanacOne will also create a report of your compass check that can be saved as a PDF file or printed for the ships records.

Celestial navigation instructors love ezAlmanacOne because it does celestial navigation exactly as they teach it.  Values obtained from the Nautical Almanac and Pub. 229 are clearly identified with an icon of the book.  When you press the book icon you are taken to the page that has that value with the row, column and value highlighted.  Even when ezAlmanacOne is doing all the work, it can teach you how to do it manually using the books.

For manual celestial navigation you can generate and print Nautical Almanac pages to use as a backup on a passage.  You can even print the sight reduction forms and plotting sheets you will need.

ezAlmanacOne performs all astronomical calculations using the NOVAS 3.1 software from the US Naval Observatory (USNO) and a JPL ephemeris that covers the years 1960 through 2059.  It also implements WMM-2020, the latest World Magnetic Model software available from NOAA, to compute magnetic declination.  Since all calculations are performed in the software, ezAlmanacOne is fully functional with no dependency on the internet.

## Key features

- Automated sight reduction and LOP plotting
- Manual Nautical Almanac and Pub. 229 table access
- Observation archiving and restoration
- Compass check functionality
- Printable Nautical Almanac pages and reports
- Universal app for iOS and macOS

## Chart rankings

- #104 in Top Paid · Navigation (US App Store)

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/ez-celestial-navigation/id1547239240/reviews.md

### 5/5 — Great for Learning and Navigating

*2026-02-10*

I am working to become a better celestial navigator and the program has been terrific at reinforcing use of the Almanac and sight reduction tables. It works as a standalone celestial calculator or in consort with traditional sight reduction methods. It is very quick to learn using the sample problems included. The integration of the Almanacs and HO 229 is what made the decision to use the program so easy. The celestial body selection tool works so well. I am anxious to see how well all things go once I am in offline mode. I am using on an iPad Pro with rugged case and keyboard, so data entry is quite easy. I will still carry all the books but the program sure helps out when I am missing current hard copies for the area of the World I am in.

### 5/5 — Very versatile fast and accurate

*2024-11-10*

I loved using ez Almanac expert.  Ez Almanac One is its successor. I was used to the old interface, but have come to appreciate the increase in functions and the 100 yr almanac included. No more buying new almanacs in app. It allows full manual sight reduction, if one prefers, with out having to carry several pounds of books. It works offline, and instantaneously in fully automatic mode. It allows analysis of LOPs, compass calibration, running fixes and much more. Now it even runs on a smartphone.

### 5/5 — Great for cel nav class!

*2024-04-15*

I found it helpful in my cel nav course.  I found the app useful to check my plotted data and helped me save time in finding my errors when my hand drawn plots went awry.

### 5/5 — Review

*2024-01-19*

App has been great for some of my Celestial Navigation Courses. 

Thank you so much. 
Fraser

## Frequently asked questions about EZ Celestial Navigation

### What devices does EZ Celestial Navigation support?

EZ Celestial Navigation is a universal app that runs on iPhone, iPad, and iPod touch devices. It also supports the new MacBook with M1 processors, offering broad compatibility across Apple's ecosystem.

### How does EZ Celestial Navigation help users learn celestial navigation?

The app includes a quick start guide, usage examples, and detailed documentation to help users learn celestial navigation. It also clearly identifies values from the Nautical Almanac and Pub. 229, allowing users to see how calculations are performed manually even when using automated features.

### Can I use EZ Celestial Navigation offline?

While the description does not explicitly state offline capabilities, celestial navigation calculations typically rely on almanac data and astronomical calculations that can often be performed without an active internet connection once the app is installed and data is available.

### What is the price of EZ Celestial Navigation?

EZ Celestial Navigation is a paid application priced at $29.99. This one-time purchase grants access to all its features for celestial navigation calculations and tools.

### How often is EZ Celestial Navigation updated?

The app was last updated on January 14, 2025, indicating active development and support. Users can expect ongoing improvements and compatibility updates.

### Does EZ Celestial Navigation have ads?

No, EZ Celestial Navigation does not contain advertisements. As a paid application, it offers an ad-free experience to its users.

### What is the age rating for EZ Celestial Navigation?

EZ Celestial Navigation has an age rating of 4+. This indicates it is suitable for users of all ages, with no content restrictions.

### How does EZ Celestial Navigation compare to traditional methods?

EZ Celestial Navigation performs celestial navigation exactly as it has been done for hundreds of years, producing Nautical Almanac and Pub. 229 tables in their printed form. It offers both automated calculations and direct access to tables for manual usage, bridging traditional techniques with modern technology.

## Version history (last 5 releases)

### 1.3 — 2025-01-14

Updated magnetic model to NOAA EMM2025.

### 1.2 — 2024-10-01

Minor bug fix and periodic maintenance.

### 1.1.28 — 2023-12-14

Minor internal changes.

### 1.1.27 — 2023-10-13

Minor internal changes.

### 1.1.26 — 2023-09-15

Minor internal updates.

## Apps similar to EZ Celestial Navigation

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [StarPilot](https://appshunter.io/ios/app/starpilot/id359071446) | 4.9 (8) | $49.99 | Navigation |
| [Celestial Nav](https://appshunter.io/ios/app/celestial-nav/id1569880598) | 4.3 (10) | Free | Navigation |
| [GPS Anti Spoof Pro](https://appshunter.io/ios/app/gps-anti-spoof-pro/id1379926231) | 5.0 (7) | $19.99 | Navigation |
| [EZ Sextant](https://appshunter.io/ios/app/ez-sextant/id6477748851) | 5.0 (4) | $24.99 | Navigation |
| [CamSextant](https://appshunter.io/ios/app/camsextant/id1076411081) | 4.3 (6) | Free | Navigation |
| [Celestial Navigator](https://appshunter.io/ios/app/celestial-navigator/id696927722) | 2.0 (3) | Free | Navigation |

## More apps by EZ Celestial LLC

- [EZ Lunars](https://appshunter.io/ios/app/ez-lunars/id1607908384)
- [EZ Nautical Almanac](https://appshunter.io/ios/app/ez-nautical-almanac/id6468887411)

All apps by EZ Celestial LLC: https://appshunter.io/developer/504153123

## Related topics

[ez celestial navigation](https://appshunter.io/ios/topics/ez-celestial-navigation) · [ez nautical almanac](https://appshunter.io/ios/topics/ez-nautical-almanac) · [perpetual nautical almanac](https://appshunter.io/ios/topics/perpetual-nautical-almanac) · [ez sextant](https://appshunter.io/ios/topics/ez-sextant) · [celestial navigation](https://appshunter.io/ios/topics/celestial-navigation) · [almanac nautical](https://appshunter.io/ios/topics/almanac-nautical)

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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 2026-09-06.*