Oh, I had map contacts on to see if the bearing lines were indeed intersecting where the contact was. They however fanned out along with the target (note I was getting my bearings from he WO, and using only the Bearing data, ignoring the map contact). Because of this I was able to determine the course of the contact after I had a go with the lines of bearing.
Contact original bearing was 090, my boat was on a East heading. I steered the bow toward the smoke, which took me on a northerly heading, contact at 0 degrees, and first mark and lines made, after two minutes, bearing 359, next two, bearing 358, ect.
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