Navigational Aid For Visually Impaired PeopleOn Track is a app which will talk to any built in compass and convert heading / course information into audible tones telling you which direction and how much you need to turn to follow a course.Its ideal for anyone who has to follow a compass heading but finds it difficult to read one. Whether you are a:mountain walkerrambler sailorhorse trekking Or anyone who needs to follow a course but cannot read a compass.It will give you the information you need to hear via your speakers or headphones.All you do is press start and enter the heading you want to follow. You can change your heading at any time you need and it will direct you which way to turn and by how much via the audible tones.