The captain's yacht carried onboard the USS Enterprise NCC-1701-D and other Galaxy-class starships are used for the captain's personal use, normally diplomatic missions. The yacht measures 18 meters long, 10 meters wide, and 8 meters high, with a mass of 95 metric tons. It's located in the center on the ventral side of the saucer, directly below the bridge.

The Enterprise's yacht was made of tritanium and duranium. It was designed to serve as a self contained, multipurpose vessel, but was used almost exclusively to transport personnel and visiting dignitaries when transporters were inoperable or inappropriate. The interior of the yacht consisted of a flight deck, two staterooms, accommodation for the flight crew, and a galley. Hatches allowed access to the engineering area and the impulse engines, which surround the habitat area. The ship was normally crewed by two pilots and a service representative who tended to and assisted any diplomatic guests. The yacht was equipped with a deflector grid, impulse engines, aerodyne flight motors which were used when it entered a planet's atmosphere. In space, the yacht was capable of achieving a maximum velocity of 0.65c; in a class-m atmosphere it has a cruise velocity of Mach 6, and can reach up to Mach 20.

Unlike shuttles, if necessary the yacht could be launched at speeds as high as warp 7. Once it has separated from the main vessel, the yacht safely decelerates until it reaches sublight operating speeds.

According to Patrick Stewart the captain's yacht on the Enterprise-D was called the Calypso.