Ram Mount Handlebar Mount for Garmin Nuvi 500 and 550
So far this is working great. It is mounted on handlebar.  With the rider on the saddle it is on my left.  Had to be careful not to pinch the wires but that was easy. It does not interfere with the view of the gauges/speedometer/etc.  Real glad to have it.  I have not had it off road yet - we'll see.