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Originally Posted by 558800
By the way, except the method of made the plotting team, how can I estimate the speed of target in the sh3 by the periscope's reading. It never tell me the course of target.
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Use the 3 minute rule. Plot the position of the ship on the attack map with Mr Pencil. Three minutes later, plot the new position. Now with the compass or ruler measure the distance between the "x" marks. Multiply by 2 and drop the decimal point. In other words, .6 miles = 12 knots. I'm assuming you're using imperial measurements here. In the U-Boat I use the nomograph, which lets you use any time interval you wish. The longer the time interval is the more accurate your speed estimate.
You can also extend the line between the points for a rough course. Keep plotting points to refine his course and speed.
In the Pacific, you can use the attack map with the position keeper turned on to compare your speed and course to the actual speed and course. If your aiming point drifts away from the position of the target, it means either your speed estimate or course estimate are slightly off. Readjust the TDC from periscope view and recheck for accuracy. When everything looks steady, down scope, wait for your shot and hit 'em with the scope down. THEN tell us how great the U-Boat is. The Germans would kill for an American submarine.
I'll let someone else jump me about the type XXI. But they never saw meaningful combat.