Sat Navs on bikes

[locksmith]

I use a Garmin Zumo 550 with a RAM mount on the handlebar wired in to an Autocom system. Expensive to set up but is the dogs danglies.
Plays mp3's as well as navigation
Transfer from bike to bike so lasts a long while.

I've had it that long the Zumo is a little old fashioned now in that the Garmin features are greatly advanced now (like photo real junction display and lane guidance prompting etc, but I wont update till it breaks!