A slight aside: does anyone know if it's a bad idea or not to strap a smart phone to the handlebars? Do phones survive the shaking? I've been struggling to get to grips with my Garmin, and look at my phone sitting there, loaded up with IGN and open source maps, ready to rock'n'roll (used for nav while hill-walking). It would be a lot easier to use that than sort out the Garmin, which I have totally failed to understand.