EZ Celestial Navigation1.3 - App Store

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.

Version History Updated magnetic model to NOAA EMM2025. 1.3 01/14/2025 Minor bug fix and periodic maintenance. 1.2 10/01/2024 Minor internal changes. 1.1.28 12/14/2023 Minor internal changes. 1.1.27 10/13/2023 Minor internal updates. 1.1.26 09/15/2023 - Fix minor bug in last release 1.1.25 08/15/2023 - Fix a problem that occurs when trying to save more than 100 observations.
- Allow object selection from a list in 4 screens. 1.1.24 08/14/2023 improvements to the printing function. 1.1.23 06/20/2023 Minor bug fixes. 1.1.22 03/03/2023 Restored zoom/pan capability. 1.1.21 02/20/2023 Minor bug correction. 1.1.20 02/09/2023 Fix to use proper keyboard on iPhone. 1.1.19 08/07/2022 Always making the app a little better! 1.1.18 08/04/2022 - Improvements to the Quick Fix function
- Apply Trip and Note text to a fix
- Output Trip and Note text in fix reports 1.1.17 07/02/2022 Improved quality of almanac page output. 1.1.16 06/06/2022 Now provides option to print colored Nautical Almanac pages on white background. 1.1.15 04/29/2022 Fix typo on Pub229 page header and footer. 1.1.14 04/08/2022 Allow Hs values up to 130º when using artificial horizon. 1.1.13 03/13/2022 Improved table highlighting in night mode.
Dip calculation now supports eye height up to 100M. 1.1.12 03/05/2022 New equation of time calculation to match value in official Nautical Almanac. 1.1.11 02/22/2022 Minor bug fixes. 1.1.10 02/11/2022 Corrected some issues that occur when sights are made using a watch with a specified correction. 1.1.9 12/09/2021 Added new Quick Compass Check function. 1.1.8 10/07/2021 Minor correction in table highlighting. 1.1.7 09/15/2021 Minor improvements and bug fixes 1.1.6 08/23/2021