If you're just plotting from a radio report, the center of the convoy should be at roughly the center of the box representing it. The "tail" on the box represents the wake of the ships; it's the opposite of the course the convoy is on. Draw a line down that course, which should be the way the convoy is going. Since you should know the speed, you can estimate where they'll be in 1 hour, or 10 hours, or whatever time you want. Try to arrive in front of them before they get there, and wait.
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We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, that we are now qualified to do anything with nothing.
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