This is a terrific app for reducing celestial navigation sights. Easy to use and is exceptionally accurate. You can change the settings to suit your preferences. It will store your sights and allow you to select which ones to plot. I’ve tested it many times against hand calculations and every time and it comes right on the money. I highly recommend this app.

I’m running this on an iPad 4 Mini and having a blast relearning what I once learned with a calculator and reams of graph paper. Seamless integration of sights, reduction, and plots. I especially appreciate the sight entry, storage, edit, and selection features — well thought out and very handy. Simple and capable, I will be using this for fun and to teach and demonstrate the craft. Thank you for the superb app!

This app is terrific! It is good to learn the “long way” of plotting your position but once you learn, then this app makes it so much easier and faster. All you need is your sextant and your watch and let the fun begin.

There is evidently a lot of thought and effort that has gone into the math and the mechanics of this app. It definitely has potential to be great. Unfortunately user interface problems detract from its usefulness.One example. Depending the size of your screen, you might or might not be able to enter latitudes and longitudes. On my iPhone 7, the digits are obscured due to lack of space.