The top of the dash is the right place as you can safely view and adjust while driving and looking out the windshield constantly. Unfortunately, as was mentioned, there is very little room under the top of the dash. I am using the Street Pilot with the included sandbag base, and it stays very well. I have left it in place going up and down some very steep inclines (looking at dirt in front of the hood) and it has never moved. I do remove it from view when parked in certain locations, though.
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