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By Tony Duff

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D. If the Approach Officer reports THE TARGET IS ZIGGING TO HIS RIGHT (LEFT), zig the target 30 degrees in the indicated direction and await further observation of the angle on the bow to adjust the TDC. htm (42 of 110)7/19/2006 15:24:06 Submarine Torpedo Fire Control Manual CONFIDENTIAL SLM 1 e. If the Approach Officer reports NO CHANGE, announce the generated angle on the bow. (f) Speed Determination The TDC Operator must coordinate the determination of target speed through his own analysis and that of the Assistant TDC Operator and Plot.

In low power each small division represents one degree while in high power each all division represents 1/4 degree. If the Approach 5-2 CONFIDENTIAL SLM 1 Officer knows or can estimate the masthead height of the target in feet the number of horizontal divisions covered by the ship between its water line and masthead will be a measure of the range of the target. In the figure the target subtends 5 divisions in high power and 1 1/4 divisions in low power. It would obviously be impracticable to convert this value of angle to range at each periscope observation.

If the target ship can be properly identified an accurate value may be obtained from intelligence information supplied the ship. htm (31 of 110)7/19/2006 15:24:06 Submarine Torpedo Fire Control Manual (1) Count or estimate the number of decks that are seen above the main deck. (2) Add to this figure the approximate number of deck heights equal to the observed freeboard. 5-5 CONFIDENTIAL SLM 1 (3) Multiply the total by eight to determine the height of the top of the bridge structure above the visible waterline.