[4] The simulator consists of a gantry frame, with an overhead carriage from which test craft were suspended by cables.

[6] It is the only surviving simulator from the NASA Gemini and Apollo space programs that was used by astronauts to practice docking of space capsules with other vessels.

[3] Ability to dock reliably with the Apollo Lunar Module was a crucial skill essential for the mission to return from the Moon.

[5] The docking simulator was used alongside the Projection Planetarium in training exercises.

[3][5][7] Currently it is stored, hanging from the rafters in Building 1244, a vast hangar at Langley, and there are no plans for it otherwise.