This application can track your GPS coordinates and record it into GPX file. You can send this file via email or download using iTunes File sharing feature. You can use produced GPX file to geotag your images. If you own Sony Alpha camera you can use GPS Embedder to store GPS position in your ARW file. Follow this link for details http://dslrsoftware.com/gps_embedder.php
This is just one but not the only possible scenario for this software.