Since we don't have maps and pen have no real use in game. I though if it is possible to implement something like a paper map for each city... but one that you could write with a pen... just to take notes... maybe able to X where you have already explored. I know that it already exist http://pzmap.crash-override.net/, but I think is kind of a cheat to use this. Not like a minimap... but something you have to open in your screen, when you hold in your primary slot.