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The US Navy-designed Mark 37 Director was used to control the fire of the 5”/38 caliber dual purpose batteries against both aircraft and surface targets, to direct the fire of starshells for the illumination of surface targets and to position the searchlights. These directors were commonly installed on many classes of US Navy and US Coast Guard ships from World War II through the Vietnam War. Some ships of the Royal Navy carried this director including the Royal Navy's last battleship, HMS Vanguard.
Unlike the early "square-back" (available separately), the late "Square-back" Mk.37 directors featured a shielded, open director captain position, known as a "Control Officer's Cockpit". HMS Vanguard carried four of these directors, with UK-designed centimetric Radar Type 275 fit to them giving the ship true "blind-fire" capability.