Well to make a long story much shorter: The chronometer in SH4 *should* calculate speed, but it is broken currently in the game.
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Assuming we're working with a fairly accurate representation of a WWII era USN TDC (eg, Mk4), why are we trying to calculate target speed at all? Target speed is a TDC ouput, not an input.
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That's partially correct. You could/should enter speed estimates in the TDC to start the position keeper function and by observing the difference between the predicted (By the PK) bearing of the target and the actual bearing of it, you could refine the solution. It's the tracking party who would calculate speed by measuring in the CIC with the "speed" ruler the distance between 2 observations at a given time.
Making it all short again: In SH4 playing with manual Torpedo shooting, you currently must calculate the speed on your own and input it in the TDC via the slide out tool on the upper right corner of the screen.
Hope that helps
