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Figure 1: Rangekeeper Coordinate System. The coordinate system has the target as its origin. The y axis value range to the target. US Navy rangekeepers during World War II used a moving coordinate system based on the line of sight (LOS) between the ship firing its gun (known as the "own ship") and the target (known as the "target").
Night naval engagements at long range became feasible when radar data could be input to the rangekeeper. The effectiveness of this combination was demonstrated in November 1942 at the Third Battle of Savo Island when the USS Washington engaged the Japanese battlecruiser Kirishima at a range of 8,400 yards (7.7 km) at night.
The US Navy's first deployment of a rangekeeper was on USS Texas in 1916. Because of the limitations of the technology at that time, the initial rangekeepers were crude. For example, during World War I the rangekeepers would generate the necessary angles automatically but sailors had to manually follow the directions of the rangekeepers.
Mark 1A Computer Mk 37 Director above the bridge of destroyer USS Cassin Young with AN/SPG-25 radar antenna. The Mark 1, and later the Mark 1A, Fire Control Computer was a component of the Mark 37 Gun Fire Control System deployed by the United States Navy during World War II and up to 1991 and possibly later.
A German anti-aircraft 88 mm Flak gun with its fire-control computer from World War II. Displayed in the Canadian War Museum.. A fire-control system (FCS) is a number of components working together, usually a gun data computer, a director and radar, which is designed to assist a ranged weapon system to target, track, and hit a target.
The Mark 8 Fire Control Computer was developed by Bell Laboratories during World War II.It was initially requested by the USN Bureau of Ordnance as an alternative to the Ford Instruments Mark I Fire Control Computer, in case supplies of the Mk I were interrupted or were unable to be manufactured in the required numbers. [1]
This capability gave the United States Navy a major advantage in World War II, as the Japanese did not develop radar or automated fire control to the level of the US Navy and were at a significant disadvantage. [17] Fire Control Switchboard. The Parallax Correctors were needed because the turrets were located hundreds of feet from the director ...
The 5"/54 caliber or 5"/62 caliber Mark 45 gun is fully-automated and capable of engaging surface targets in an anti-ship role, air targets in an anti-aircraft or defensive anti-missile role, and land targets in a naval gunfire support role. The gun has a range of 13 nmi (24.1 km) for 5"/54 variants [4] or 20 nmi (37.0 km) for the 5"/62 variant ...
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