I don't know about a formula, but I have seen somewhere online how to do it using the ruler and other map tools. You make a ruler line the length of the approximate speed of the convoy in the direction they're traveling, and make a cirlce around the end of the line you just made with a radius of your speed. Draw another line from your sub to the contact report position. Now take the protractor and measure the angle between the contact, to the point where the line between you and the contact meet the circle, then to the end of the line suggesting the contacts path. Take that measured angle and go from the contact to your sub and cross the path that will be taken by the contact. You should get your heading.
Hopefully that makes sense! I'm currently out of town working, so i can't make a screen shot or pictures to explain. I dont remember where i found this online, but a google search may help you. it was in a tutorial for SH3
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