I spoke too soon about the pen, by the way. I have a graphic tablet and just can't draw a straight line with the pen on the screen. It is just like a normal pen too except it doesn't have ink, of course. I've been trying to make maps with routes and circles but they look like a game of snakes and ladders, played by people with blindfolds on. It's a shame. I thought it was going to be so useful, and 'user-friendly', as they say.
zwiebel, does the tablet you are using support PolarisOffice? if so (they are generally andriod 4.0 tablets) then there is an app for map-making that will help with the pen situation!