Master systems display

On Federation starships, the master systems display (abbreviated MSD), also known as the master situation monitor, or master situational display, is a large, wall-mounted computer display in Main Engineering and on the Bridge. The display features a large cutaway diagram of the vessel, and was used to provide a detailed overview of the ship's status.

The USS Enterprise-D had its master systems display in Main Engineering, while the starships USS Voyager, USS Defiant, and USS Enterprise-E all featured their displays on the Bridge. MSDs for Constitution class starships could be loaded up from the computer.