The main guns of the "King George V"-class ships were controlled via two director control towers, one on top of the bridge superstructure and one aft of the mainmast. Each of the control towers was equipped with 15 foot rangefinders and fed targeting information to an Admiralty Fire Control Table, Mk IX. In the event that the control towers were disabled both "A" and "Y" turrets had internal 41 foot rangefinders whilst "B" turret had 30 foot rangefinders. The first two ships of the class to be completed, "King George V" and "Prince of Wales", carried four HACS Mk IVGB directors for the ship's secondary 5.25-inch guns as well as six Mk IV pom-pom directors; all ten of these directors featured Gyro Rate Unit, tachymetric fire control. "Duke of York" and "Howe" had HACS Mk V directors, with "Anson" having the Mk V directors replaced by the updated Mk VI.