You should be about 15 or so miles away, that will give you time to set up a good shoot by tracking the convoy on radar and plot it's course and get speed using the three minute rule.
Mark the position and start the clock, three minutes later mark again and measure the distance between marks. 1 knot for each 100 yards.
500 yards = 5 knots, 10,000 yards = 10 knots etc. I do this three times and that will give you a good course line as well.
Once you have this you can set up an intercept point and be there waiting.
Magic
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Reported lost 11 Feb. 1942
Signature by depthtok33l
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