I would like to buy equipment to do participatory mapping studies. What I am looking for is a digital table (kind of like a giant i-pad) on which people can write with a special pen. The information can be saved in digital format and exported in mapping softwares (e.g. ArcGIS). The map can also be transfered to a screen on the wall. I have seen such a device before, but can't remember how it is called, what company makes it, how much it costs, etc.
Any information would be greatly appreciated!