Actually, the game itself does the computations using the TDC. Range is calculated by selecting the correct ship then adjusting the stadiometer (?) lines to bracket the waterline and top of the mast. AoB is either a matter of experience at estimating or can be figured by marking the ship's course over time. And speed is also automatically (although not always terribly accurately) calculated by locking the periscope/UZO onto the ship then selecting speed then clicking the stopwatch on the notepad. Ther should be no reason to leave the SHIII game window to perform any of the calculations required for manual targeting.
Unfortunately I'm at work and can't be more detailed but, if no one else helps you before I get home (which I highly doubt; there are lots of helpful people here --smiles--) I'll try and give you more details.
Happy hunting!
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