# iMariner Celestial Navigation

> Celestial navigation toolbox with almanac, sight reduction, and position fixing. (iPhone/iPad app by DFR Editions.)

- Source: https://appshunter.io/ios/app/imariner-celestial-navigation/id510326933 (this page in markdown: same URL + `.md`)
- Developer: [DFR Editions](https://appshunter.io/developer/506383717)
- Category: Navigation, Utilities
- Price: $26.99
- Rating: 4.40/5 from 10 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.4 · 37 MB
- Languages: American English, French (France)
- Released: 2012-03-20
- Data updated: 2026-07-04
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/imariner-celestial-navigation/id510326933/reviews.md

## What is iMariner Celestial Navigation?

iMariner Celestial Navigation is a complete toolbox : sight, fix, meridian, starfinder, solar compass
Also embedded : nautical almanac (sun, moon, planets, starts) and astronomical computation (no more need for HO-249/HO-229 tables)

- displays almanac informations : Sun, Moon, Venus, Mars, Jupiter, Saturn and 92 brightest stars. At this step, you can use these almanac data with HO.249 tables, if you want to reduce manually.

- reduces a sight : getting your observed altitude and the precise time, it calculate Intercept and Azimut. You don't need any calculation ! Simply report Intercept and Azimut to your navigational chart.

- You can save your observations by passages and send them by email in CSV format

- take a fix : with two sights, iMariner is able to calculate your position (latitude/longitude)

- meridian passage : iMariner helps you to take observations mandatory to know your position (latitude/longitude)

- sight preparation : iMariner proposes you the best objects, here position (azimut and elevation), and the approximate time of the day the observation can take (nautical_twilight or nautical dawn).

iMariner is a standalone application. It doesn't require internet connection. It is light and calculations are optimized to save energy on your boat.

Includes a solar compass (and moon compass too).


REFERENCES :

iMariner has been inspirated by astronomical works of the following people.

Brightest Stars Catalog

Extraction of 92 stars >= 2.5 Mag from the vizier catalog, completed with some stars and star names.
V/53A Catalogue of the Brightest Stars (Ochsenbein+ 1988)
This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France
vizier.u-strasbg.fr
=============================
Le catalogue des etoiles les plus brillantes Catalogue of the brightest stars
Ochsenbein F., Halbwachs J.L. =1987BICDS..32...83O
Ochsenbein F., Acker A., Legrand E., Poncelet J.M., Thuet-Fleck E.
=============================

AlgorithmsFrom the reference book Astronomical Algorithms by Jean Meeus

Planets : VSOP87D theoryTables extracted from ftp://ftp.imcce.fr/pub/ephem/planets/vsop87/ and adapted to Objective-C.

Bretagnon P., Francou G., : 1988, Astron. Astrophys., 202, 309.
Pierre Bretagnon, Gerard Francou Bureau des Longitudes
77, Avenue Denfert-Rochereau F75014, Paris, France

Moon : ELP2000 theory

The lunar ephemeris ELP2000 M. Chapront-Touze and J. Chapront
Service de Mecanique Celeste du Bureau des Longitudes
77, Avenue Denfert-Rochereau F75014, Paris, France


Sky Maps

Free maps from the IAU site : http://www.iau.org/public/constellations/

DeltaT value
maia.usno.navy.mil

## Key features

- Sight reduction for intercept and azimuth
- Position fixing with two sights
- Meridian passage calculations
- Embedded nautical almanac
- Solar and moon compass
- Offline functionality
- Observation saving and export

## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/imariner-celestial-navigation/id510326933/reviews.md

### 1/5 — Over priced

*2023-08-13*

Somewhat lacking in features for the price.  I wish for a full refund.

### 5/5 — Une appli simple, complète et précise

*2023-02-06*

Testée en comparant les résultats proposés par l’appli avec des calculs effectués de façon traditionnelle

### 5/5 — Incredibly useful

*2021-03-06*

I use this app daily aboard ship and it saves me lengthy calculations. Worth every cent!

### 5/5 — Excellent app, great service

*2017-02-07*

I use this app every day as a professional navigator. Very good for quick azimuths. iOS update created some color problems. I emailed them, and the problems are fixed with a new version very quickly.

### 5/5 — Perfect

*2014-09-20*

Très bien, pour un prix raisonnable avec actualisation rapide et efficace.

### 1/5 — Average

*2014-04-20*

The star chart isn't for viewing it's just a static page, no gyroscope to look and match up, so end up flipping between apps. 

The compass also is static....you have to move it around and point it to the correct direction to tell you anything useful- so not really fit for purpose.

Certainly Not worth the money!

### 4/5 — Cool app

*2012-12-11*

I've been impressed with this app since I figured out how to use it. Really all I'm doing with it is using it as a calculator for sights I've taken and it's a labor saver. I use a drum sextant and enjoy it. This calculator makes the solution faster to arrive at. That said, I still do it longhand because electronics can, and often will fail. Of course, this is why we still use sextants and windvanes :p

## Frequently asked questions about iMariner Celestial Navigation

### What is iMariner Celestial Navigation?

iMariner Celestial Navigation is a comprehensive toolkit for celestial navigation. It offers features like sight reduction, position fixing, and an embedded nautical almanac, designed for use by sailors and navigators.

### Does iMariner Celestial Navigation require an internet connection?

No, iMariner Celestial Navigation is a standalone application and does not require an internet connection. This makes it ideal for use on boats where connectivity may be limited.

### What astronomical data does iMariner Celestial Navigation include?

The app includes an embedded nautical almanac with data for the Sun, Moon, Venus, Mars, Jupiter, Saturn, and 92 brightest stars. It also performs astronomical computations, removing the need for physical tables.

### Can I save and export my observations with iMariner Celestial Navigation?

Yes, you can save your observations by passages within the app. These saved observations can then be sent via email in CSV format for further analysis or record-keeping.

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

iMariner Celestial Navigation is a paid application priced at $26.99. This one-time purchase provides access to all its celestial navigation features.

### What devices is iMariner Celestial Navigation compatible with?

iMariner Celestial Navigation is available for iPhone, iPad, and iPod. It is designed to run on iOS devices.

### How often is iMariner Celestial Navigation updated?

The latest version of iMariner Celestial Navigation is 4.5, which was last updated on May 26, 2023. Updates typically include improvements and new features for the navigation tools.

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

iMariner Celestial Navigation has an age rating of 4+. This indicates that the content is generally suitable for all ages.

## Version history (last 5 releases)

### 4.5 — 2023-05-26

More precise stars computation :
Simbad Database from http://simbad.u-strasbg.fr/simbad Centre de Données astronomiques de Strasbourg Observatoire de Strasbourg 11, rue de l'Université - 67000 STRASBOURG, France
Nutations from https://hpiers.obspm.fr/eop-pc/models/nutations IERS EOP PC Observatoire de Paris 61, avenue de l'Observatoire 75014 Paris/ FRANCE

### 4.4 — 2023-05-01

Fix crash in iOS 16.4

### 4.3 — 2023-01-04

Fix a crash in Star Finder

### 4.2 — 2022-11-09

Passage Edit enhancement
    Tapping the cell will enter the text edit mode
    Tapping the accessory button will got to the sights

Passage Edit enhancement
    Update the 'hamburger' Reorder Control color from Gray (default) to white

### 4.1 — 2022-02-15

Fixes crash in the mailer.

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## More apps by DFR Editions

- [Hand Bearing Compass](https://appshunter.io/ios/app/hand-bearing-compass/id506383714)
- [Solar Compass by iMariner](https://appshunter.io/ios/app/solar-compass-by-imariner/id509901059)
- [iMariner Offshore](https://appshunter.io/ios/app/imariner-offshore/id521564127)
- [NMEALink](https://appshunter.io/ios/app/nmealink/id857780122)

All apps by DFR Editions: https://appshunter.io/developer/506383717

## Related topics

[imariner celestial navigation](https://appshunter.io/ios/topics/imariner-celestial-navigation)

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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 2026-07-04.*