They could have changed course on you. Far easier to plot a course to lie in wait ahead of them as long as they are not too far away.
Good chance though that they were on an established route, another convoy will probably come along on the same general course.
I like to wait in Sibutu Passage area or the northern end of Makassar Strait if I can, or on the eastern side of the Celebes Sea just southeast of the Philippines.
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