*When the warp drive system on the U.S.S. Enterprise is not operating or simply not called for, the ship will use its impulse drive for propulsion. The impulse engines are capable of driving the ship at sublight speeds. They are designed for docking maneuvers, and interplanetary or sublight interstellar flight. The fusion-powered impulse drive system on a Galaxy class starship actually consists of two sets of impulse engines -- the main engine located on Deck 23, and the saucer module engines located on Deck 10. The saucer module of the U.S.S. Enterprise is equipped with impulse drive only, for propulsion in the event of an emergency separation sequence. *Source: Back of card