Quote:
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Originally Posted by akdavis
Quote:
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Originally Posted by UrPeaceKeeper
Another way to measure it is to set your periscope just infront of the ship (this method works best when you are as close to perpendicular as possible with the targets path) Get out the chronometer and when the bow of the ship hits the vertical line in the periscope start the chronometer. DONT MOVE THE PERISCOPE!!! when the Stern of the ship hits the vertical line stop the chronometer. Get out the paper manual that came with the game. Now divide that length by the time and multiply by two. This gives you a pretty good guestimate of the speed (in knots) I always round up to the nearest half a knot to compensate for any errors and angle issues that come up when you are not perfectly perpendicular to the target when measuring. So far so good! It's more accurate than the guess speed button for the US TDC. Havent tried to work out manual targeting on the U-boats yet, been playing around with my Pocket BB too much 
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Yes, but this only works for AOBs near 90, correct? |
Any object of known length will traverse a point in space at the same time no matter the observed angle. If the AOB is zero there will be no observable speed across the fixed point ie Perscope crosshairs or periscope edge, but with any measurable AOB the target motion across the point of reference will be visible therefore measurable. Just remember that own ships speed can offset fixed point of reference speed estimate.
If you are behind, unless you can end round your screwed anyway, if your in front and AOB is zero, you may have a shot and of course you should open up the angle for an ideal solution.
Any good skipper will use many methods to get good solution data, nomogragh, fixed reference, plotting and measuring time, distance. I personally use the built in speed estimate with good results. Just remember that the greater the range to contact the greater the error. Get as many estimates as possible and average them out.
There are many posts on this topic, just not in the mod forum.