In my experience GPS technlogy just isn't quite there yet! While it does sometimes get the position right on the loaded/base map, mine (a Garmin V) spends alot of time saying that I'm off the route and it must recalculate. This seems to happen mostly when I'm about to negotiate a particularly tricky set of turns! What it does brilliantly is confirm your position and you will know immediately if you are heading in the wrong direction. I don't know about other models but this one in particular takes a long time to download detailed maps and routes and for a long journey this will be a pain - i.e. it will need at least half an hour every day connected to a laptop to download the info.
It is fun though and I'd much prefer to have one than not but a paper map, sufficiently detailed, should be your main guide with the GPS offering valuable and time saving support.
Other more expensive models may do better but I have no experience of them.
Have a good trip!
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