I wouldn't worry about range. If you have the speed, bearing, and AOB correct, entering a range figure into the TDC becomes pointless. That being said, you should always get as close as possible.
For speed, have you tried using the nomograph that comes with NYGM? It seems accurate to within +/- 1 knot.
If I'm not positive about the speed, I always fire a salvo. I set the spread degree based on approximate range and ship type. Use a tighter salvo for longer shots and smaller targets.
Keep in mind that manual targeting can take some time to learn. I was aweful when I first started. Experience and intuition can play a significant role in your success. Keep at it and you'll get the hang of it, and when you do ... you probably won't want to go back to auto-aim.
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