The Mark X bridge simulator was a bridge simulator at Starfleet Academy's Starfleet Training Command in the 23rd century. This simulator, located on the second level of a building, was in room #217. The simulator was listed with other simulators on a directory placard. (Star Trek II: The Wrath of Khan, set artwork) The placard mentioning this simulator was sold on It's A Wrap! sale and auction for US$31.99. [1]