My EVO II Pro will be delivered next week. I would like to buy a small tablet to use as the display. My question is, how important is it to have GPS and cellular on the tablet? Apple iPads typically don't have GPS unless you get the cellular version (more expensive). Samsung Galaxy Tabs all seem to have GPS built in. What would I lose by NOT having GPS on the tablet? Is cellular plan required to use the maps function? I've been searching around this forum and haven't found definitive answers.