Originally Posted by JohnJ80

You'll likely lose the mapping features since that comes over the network. It will keep all your gps and route data and it should upload just fine - and look fine on the map when it's on line. Just no map while riding unless you get an app that has downloaded maps. Navionics or some of those would have no need for a network.

If you mean physically protect the phone, there are any number of cases that will do that. I have a ruggedized case that I put my quadlock piece on and it sits on my stem. Works great and if it ever fell off or I crashed, it would be very well protected.

J.