I think with the amount of information available on modern mobile phones (navigation tools, shop locators, easy internet access) a dedicated GPS unit is kind of obsolete.
As a dashboard/handlbar mounted nav device it has deffinate advantages. Personally, I always use a map with a waterproof case. At least if you drop a map it will still work.
But it all depends, some folk find it quite hard to read a road map and prefer the ease of a 3d screen and a voice giving you directions.
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