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010123, 03:54 PM  #1 
Sonar Guy
Join Date: Jan 2002
Posts: 396
Downloads: 26
Uploads: 0

speed calculation
Ahoy everyone!
I have been trying to get back into SH 3 and 4 and am having some problems. Up to now, I have been calculating speed by doing the time and distance calculation on the Nav map. However, I would like to use the speed calculator on the "attack data tool" in the periscope view. I have viewed a number of video tutorials and have not found one that covers this in detail. Usually wen I try to use the speed calculator I get the message that says " cannot calculate speed need more time between intervals," or something like that. Every once in a while I get a speed estimate, but have not been able to figure out what I am doing right or wrong. In my version of the game manual, page 63 refers to the "lock button" in periscope view. I have no idea where that lock button is. Cany anyone help me out? In manual targeting, is a light supposed to go on when we get an accurate solution? If someone could please post an outline of the proper steps to using the speed calculator, ( for dummies) I would appreciate it! Thanks! Joe S 
010923, 05:52 PM  #2 
Nub
Join Date: Dec 2022
Posts: 3
Downloads: 18
Uploads: 0

Although everyone seems to be measuring speed by plotting on the navigation map, the TDC is able to do the work for you. Werner Sobe shows us how to do it in this video.

011723, 11:14 AM  #3  
Tazmanian Devil
Join Date: Dec 2009
Location: NC
Posts: 209
Downloads: 340
Uploads: 0

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Now take the target's lenght divide by stopwatch's time and multiply by 1.85 will give you the current speed. (example: 104/50*1.85=3.848 knots) I recommend using a cheap calculator beside your computer, while pausing the game, uh, I mean training simulator, instead of the using the computer's calculator. Alttab can open up another can of worms. I hope this answered some of your questions, Good luck and good hunting, Captain!
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020423, 09:01 AM  #4 
Sonar Guy
Join Date: Jan 2002
Posts: 396
Downloads: 26
Uploads: 0

Thanks Ulex and Larry!
The video makes the point that you need to wait a while before you take your second plot and are in a position to do the speed calculation. I knew that because I have doing it manually but for some reason I have a mental block with the speed calculator on the TDC. I have always been skeptical of the method of measuring the time it takes for the target to pass your crosshairs, due to the fact that a variation in the angle off the bow will change the apparent length of the target. The other objection I have to it is that you have to keep the scope up the entire time, which is not always advisable. Your responses have been very helpful to me, thank you very much! I have been away from SH 3 and 4 for a while and am pretty rusty. You have helped me get back up to speed. Thanks! Joe S 
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