I'm just throwing together some Doccies and Tables to help those who like 100% 'realism' targeting through their scopes. A little bit of simple maths is required, which is why you're the Captain... right ?
A ship table where all measurements are scaled at 1 Nautical mile - Yes!! .. you're in the navy now

You'd use these measurements for range calculations

When AOB = 90 you can read the ship speed off this table by timing the ship when it passes through X degrees on the scope gradations. When AOB < 90 you scale the timing accordingly. Most accurate measurement are from 0<AOB<45
So a little test using Iowa as our 'guinea pig'.
While the ship approaches, we measure range, from mast height (No AOB) or from shiplength scaled to AOB. Read values off the first pic above.
We measure time it takes to cross 1 degree on the scope. Scale this to AOB, and read speed off the table (2nd pic) above. Punch in all the goodies into the TDC.
Timing..
Aiming/firing Tube 3
Tube three hitting.... PURE MANUAL MODE
Accuracy is fairly consistent over all speed ranges.
Next post will be a link to all the goodies - must just clean it up and add a decent doc