Just wondering if anyone uses their tom tom on their bike (not tomtom rider) I have a GO720 and tried it on my bike for the first time last night and I lost my map? Still had a good fix.. still tracking speed and long/lat but map was gone. Anyone else had problems with using their tom tom on a bike? It was working well at first. I thought about vibration but I'm not sure. Any help would be appreciated. thanks guys.