I had a similar mount a few years back. Before we had gps and google maps on phones. So I used to put my car satnav on them. On one trip over some rough ground on the road it fell off and then it got ran over by the car behind and died. So think about this before getting something like this. You may notice once you got the bike mount that although it is secure very well to you bike, the pouch that contains your phone/satnav is not permanently attached to the bar mount but by some less secure method of a clip that may come lose with vibrations.
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