Takes me back to the 80s. We had one of these in the Air Training Corps. Most of the instruments worked, and we had a moving map for the instructor. Essentially, the map was a normal map glued to the table, that had a wheeled crablike thing on top that rolled around the map showing where you were - tht didnt work that well, as the wheels would slip. My Mum never liked it when my Dad and I (he was an ATC instructor) would have the bellows off and would be repairing them on the kitchen table.