“The whereabouts of the Japanese Fleet was unknown and at one point the thinking was they would attack the Aleutians, not Pearl Harbor.”
Sorry I find that hard to believe. They had multiple listening stations from Manila to San Francisco and they couldnt pinpoint them? Seriously..
https://www.youtube.com/watch?v=2Rv2J-YDThA
Read up on it.
You might read up on what former CNO Admiral William Standley
Had to say on this, he was on the Roberts Commission that investigated Peal Harbor right after it happened.
The Japanese left the usual radio operators back in Japan still transmitting. Each radio operator had a unique style that a good listener could determine. They could tell from where he was transmitting by triangulation and they learned which ships were where.