Page "Institutions in the Southern Victory Series" Paragraph 238

New technologies were developed during the years between the Great War and the Pacific War.

The aircraft carrier developed into a mature technology, and so did the " Y-range ", the term used in this timeline for radar.

All of the belligerent powers had Y-range equipment of one sort or another ; a U. S. raid on the North Carolina coast in 1942 captured a working Confederate station, in an action similar to the British commando raid on Bruneval, France, in 1942.

To fight the submarine, " Hydrophones " was the term used for sound equipment ; it did not distinguish between passive listening and active sonar search and ranging of underwater sounds.