Yeah. Just eyeball that too. If your first snapshot after subtracting 2 kts hit the rear, and you know your aob and range were decent.. add a ful or half a knot on the next shot and go from there.
I just attacked a convoy without ever determining their speed. I got in close and just guessed 7 and hit slightly rear.
Subtracted the two for the weavers added 1 for my first error for 6kts.. and all hit where I was aiming after that.
My guess is they were originally 8kts.
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