OK, I see you have NOT read the full version of Vaughn and Pinhorn report ...
Similarly you have NOT read the W/T reports attached on the Bismarck Chase documentation, ... including the RAF Coastal Command one ...
Do not worry, when the full work will be published you will have your chance to read them Sean.
Meanwhile I suggest you a couple of good read just to realize the W/T possibilities between airplanes and ships at that time :
1) Book : John Campbell; Royal Air Force - Coastal Command ; Chapter 15 https://www.amazon.co.uk/Royal-Air-forc ... 1909544736
Where you can read that : " Marine radiotelephony first became common in the 1930s, and was used extensively for communications to ships and aircraft over water. "
It is NOT such an important point for me to explain you the W/T technology available on 1941, neither to demonstrate that McMullen was ready to talk to them being possible, just like talking to the Walrus, ...
... I remind you that my point was related to the fact that everybody including McMullen where ready to have some Flank Marking information ... no matter in which way it could arrive on that moment thru the W/T ... and that was correlated by me to the fact that also Suffolk and Norfolk felt that, in that moment, their duty was just to Flank Mark, ... after the shadowing.
How far do you think they where from Bismarck in order to do a correct BC1 warships Flank Marking, so the Hood and PoW fall of shells observation ?
Do you think that from over 20 sea miles it could be done ? I do NOT think so.
This is more important than the destroyers position and the W/T technology available on that moment and which one they were utilizing among the ones thay had available on board.
In order to honor a soldier, we have to tell the truth about what happened over there. The whole, hard, cold truth. And until we do that, we dishonor her and every soldier who died, who gave their life for their country. ( Courage Under Fire )