I use sometimes my smartphone as a navigation aid, when I move with the wheel in foreign areas. Every now and then I take with the built-in camera on an image. However, I do not like bar / stem mount for smartphones at the wheel. Now I have discovered the Tatonka part, I'm firmly on the right shoulder strap of my Deuter bike backpack. There it fits out well, since the fixing of Tatonka-part is quite universal and also keeps my estimation bombproof. Then the navigation device just 20 cm from my ear is gone and I hear the Naviagtionsanweisungen of Komoot Apps loud and clear, without my other disturbing in my area. On the display itself I do not look, and so you glide through the woods and meadows and is :-) noted from time to time by a lovely voice on changing direction). iPhone 4 and iPhone 3 GS fit in well.