I'd be very surprised if it was rugged enough to be used as a GPS system whilst on the move. I took an Asus Netbook to Morocco, but it was only used during the evening for plotting the next day's route.
Does the tablet have a solid-state memory? Forget it if it's got a 'proper' heard disk, it won't last long at all.
Why the objection to taking something like the Garmin 60CSx? They run on batteries too if you really can't be bothered to hard wire them...
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