An example of a eureka moment:
The diagram below is a visualization of evidence, with citations included, all of which mutually supports each other. Yet, the eureka moment for the person quoted above is that all of this must be wrong because Lord's overnight DR position is sacrosanct and unassailable.
See Cam, if you draw a line from Lord's DR position at 42° 05'N, 50° 07'W, to the now known wreck site position at 41° 43.5'N, 49° 56.8'W, you find a bearing line that runs 160.6° true, or S19.4°E true, from the DR position that Lord gave. That's 1.7 points east of true South, which, if stated in points, would be S by E 3/4 E true, or for all practical purposes, SSE true. Therefore,
eureka moment, Stone and Groves either lied about the ship's heading and steamer's bearing when they both independently stated that they were by reference to the compass, or they converted those angles to true headings and true bearings in their heads despite stating that they were by compass.
("Oh, what a tangled web we weave when first we practice to deceive.")
Oh, by the way, to convert from compass to true one simply has to subtract the total compass correction, which in this case was given as 22° (about 2 points) west for the date and place. Thus, to make things fit, Californian's compass heading when Stone took over the watch from Groves at 12:15am would have to be due East, and the steamer's compass bearing would have to be due South for this eureka moment to play out.
Of course, if you accept all the evidence as stated at face value below, then Lord's overnight DR position had to be wrong, and Californian was further south and possibly somewhat further west of where Lord took her to be. That's the other eureka moment.
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