Finding an intercept course is pretty easy once you know how.
First find the bearing the target is on. Either visually, or if beyond visual range via the hydrophone.
With your boat at a complete stop take note of wich way the target bearing changes. Either left or right.
Select a speed setting (I usually use Full or Flank) and start in a direction that you think should be close to an intercept.
Now you need to take note of how the bearing to target is changing over time. Is he still going across your bow, or falling astern?
Adjust your course until the target bearing remains constant over time. When this occurs you are on an intercept course.
I usually find the intercept then adjust so he slowly falls astern. This will put you ahead of the target, giving you time to go to periscope depth and get into a good firing position without being spotted.
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This is a trick I like to use in some circumstances to find target course, without knowing his range.
Get to maximum visual range. You should be able to see the target, but he shouldn't be able to see you.
Roughly match his course as best you can. Observe the target through the TBT, and take note of when he appears to be at a 90 degree AOB. (90 AOB is usually pretty easy to determine, even at long range).
When the AOB is 90 degrees, turn your boat so the target is at either 90 or 270 degrees.
When this happens the targets AOB is 90 and he is directly off your beam. So the 2 of you are running in parallel. Whatever your compass reading says will be the target's course as well.
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