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I'm not sure about car GPS, but for hiking/backcountry adventures I have really liked the Garmin eTrex Vista line. I have not bought one yet, but friends have it. The software to get topo maps (with trails) for various regions can get expensive, but when venturing off trail in the snow it is great to use for backtracking, or seeing what slopes I might be looking at over the next ridge.
I would imagine Garmin's auto GPS' would be of similar quality.
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