I use a cheapo 5" Garmin nuve 50 with topo maps..

not a good pic..but these fully inclosed cases work well.
semi water proof.. I have dunked it a couple of rivers..
and it still works...theres a foam pad in them helps with the vibration..
touch screen still works though the clear cover..
yer will fined the cases on e-bay..

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Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...