iSextant is a sun sign reduction program, that can be used to confirm your location in the event of GPS signal problems.

It is important to note that in increasing world orbital use/misuse we are always closer to the where there is an increasing chance of GPS outage.

iSextant can also be used as an aid to learning astro-navigation.

It requires that you take a sun sight using a Sextant and note various other conditions, such as pressure and temperature. Using this information along with an assumed position the program with give you GHA, Declination of the Sun followed by an Azimuth and Intercept from your assumed position.

For more information about astro-navigation please refer to

What’s New

Version 4.0

Upgraded to IOS 7+ UI and to 64bit architecture.

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

Zzz great ,

Fantastic and easy

Very easy to use. All you need is a sextant. Input a few simple items and you have your lop. If you make a mistake such as entering local rather than gmt the answer is so wrong you'll know you made a mistake. I have 4 GPS on board so I don't worry much about the fact I don't carry tables so if the world ends I will be lost.


Hydrogen Software Consulting Ltd
675.8 KB

Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© Hydrogen Software Consulting Ltd


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