Its not just any button, though. Its a button with one purpose. Touching it enables you to send an SOS Message containing your position in your preferred coordinate format, accurate to around 1m,  to anyone in your contact book.

Lakeland Fells v2.1 is now the most powerful electronic guide to all of the fells in The Lake District and Cumbria available for the iPhone today. Never before have you had features like View Assist, GPS Navigation and the SOS Button in an application that costs just 59p. Why not check out the other features that Lakeland Fells has that can make your time in the hills more enjoyable and safer?

Lakeland Fells v2.1. Now available worldwide in the App Store.