Current Doctrine - Submarines [website capture]

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The results must be evaluated before they are used conclusively if a valuable target has made herself subject to attack. 2304. Echo ranging by a submarine during an approach always presents the possibility of acting as an alarm to the enemy. An enemy vessel that hears the echo-ranging signal from a submarine may be able to maneuver to avoid attack. Conditions during the approach may make it highly probable that a periscope, when exposed, will be sighted by the enemy or that the enemy air patrol or screening vessels may force the submarine below periscope depth.

Underwater communication gives the best prospect of success. The landing party can be equipped with stethescopes to be placed in the water for listening and with a simple portable electrical transmitting device or with a bell and hammer. htm (6 of 9)7/19/2006 21:44:29 Current Doctrine Submarines (USF-25(A)) - Chapter 3 landing operation. d. Radar frequency reconnaissance, by the use of special receivers and associated equipment, can be conducted for determining the presence of radar stations installed on enemy bases, ships and air-craft.

C. with the utmost dispatch. 3402. Since they are able to operate unsupported by other forces, submarines are valuable scouts in distant waters or in waters which are under enemy control. However, in waters patrolled by enemy submarines, or when within range of enemy planes, submarine scouts must remain submerged for protection during daylight. When restricted by such conditions, the area covered by each submarine scout is necessarily small, and communication except during darkness is limited to that obtainable with the vertical antenna, which has an effective range of about 100 miles.

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