Not a good substitute

A nice looking app but for dynamic calculations youll still need an inclinometer. And compass. In my opinion youre better off with the Suunto Tandem and Sunpath software. This app cant tell you when the sun will be behind an object or allow you to point to the sky and pinpoint the sun location. It only offers a static two dimensional chart of calculations. Not that useful.

Wesley Dumont about Helios Sun and Moon Position Calculator