You can use the TDC to calculate intercept courses -- it isn't as hard as you think. Let's assume that you get a map contact somewhere to the north of you that is going ENE. You can simply draw a line from this contact off in an ENE direction (67º) for a distance. Once done, extend that line backwards so it won't interfere with your later line drawing.
Now draw a line backwards from some midpoint along the line to the target and make a mark. Then you can reclick on that mark and connect it through your boat to find an angle. This is your AOB. You can put this into the TDC.
For the sake of simplicity we will assume that you plan to intercept the target at 15 knots and your torpedo travels at 30 knots. All you need to do is double the target speed and feed that data into the TDC. If you are intercepting at 10 knots then you need to triple the target speed. If intercepting at 17 knots, then multiply the target speed by 1.4, etc.
That will give you a lead angle and it's close enough for government work. However, once I learned the method from the "hunt" post, I stopped using the TDC to work out intercept courses.
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