If the course is given as say "NE" (this assumes you are in GWX where there's no tails), then I draw two lines from the contact, one at 45+11.5 degrees (12 really), or 57, and another at 45-12, or 33, and then I draw in my 32 km sonar detection circle. I will generally make a run on the convoy if the circle isn't significantly smaller than the space between the two lines at my calculated intercept point. That of course assumes that the contact will remain on the same course which as already discussed isn't a given.
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