There is a reason that motorcycle GPS are expensive, that is because they are waterproof and very rugged. My Zumo 660 fell off my motorbike at 70mph it seriously bounced, and afterwards the zumo was still working. There was a crack in the casing so it was no longer waterproof. A car GPS is unlikely to take that much beating and when it rains you need to make sure its in a waterproof bag, but if funds are tight go for a car one.
There is an excellent Opensource map site where you can download maps which you can navigate on your zumo.
I always take my zumo as its a place for my music and it sits in a cradle and is charged from the bike so its always working
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