If you are firing from 90° to the target's course (or very close to it), then range is not really important. If you are firing at some other position then range is important. The manual targeting technique I've been using is based on the Dick O'Kane method, but with a couple of adjustments.
1) I find the target course and speed using the listed methods, and plot the target course on the nav map.
2) Using the course and speed information, I pick an intercept point and maneuver my boat to that position, then stop and wait for the target.
3) I pick a firing position, turn my scope to the chosen bearing, input range to target at the firing position (taken from the nav map), and then adjust the AOB so that the true course indicator on the top wheel of the TDC matches the target course on the nav map.
4) I wait until the target ship crosses the firing point, then fire as each point I wish to target crosses the line in the scope.
I use the map tools to figure out the range to where the target will be at the point I fire. Realistically, I wouldn't have the GPS accuracy on my own position that the game gives me, but I could use the sonar to figure out a range to target up to 5k yards away and then solve for the range at the firing position, so it works anyway.
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We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, that we are now qualified to do anything with nothing.
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