I use a Garmin Etrex Legend Cx on my ATV, with a rail mount. Never had any issue. I use the same GPS in my cruiser with the ram suction mount to the windshield.
http://www.gpscity.com/item-ram/ramb149ga16.htm
http://www.gpscity.com/item-ram/rapf166ga16.htm
The Cx doesn't seem to exist anymore, it is the HCx
http://www.gpscity.com/item-garmin-e...trexleghcx.htm
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