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What is the best portable GPS system I can buy with a maximum of $400? I want to put the GPS in my truck to use.

what's the best Portable GPS system? price isn't an issue but my uncle is 76 so it can't be all that complex

which is the best portable gps navagation system to buy? I will use this for working on the road!

Portable GPS systems - which brand is the best for the money?