Summary of John Winton's Ultra at Sea

Please note: This is a companion version & not the original book. Sample Book Insights: #1 The problem of how to use Special Intelligence, which was code-named ULTRA, was especially acute at sea, where the Admiralty traditionally exercised only remote control and gave the local Commander-in-Chief all the forces and intelligence he needed. But ULTRA eventually gave the Admiralty an unprecedented overall view of the enemy's naval operations and intentions. #2 There were many forms of intelligence available to the Allies in World War II.
The Sigint, or Signal Intelligence, Service was responsible for the interception and exploitation of all enemy radio transmissions, which might yield intelligence. #3 The Admiralty took the strictest precautions to safeguard the ULTRA secret. It was revealed only to certain Flag and Senior Officers, and not more than three other selected members of the cypher staff. The names of these ULTRA-indoctrinated officers had to be communicated to NID. #4 The British government knew that the German Navy, Army, and Air Force were all using cyphers based on the Enigma machine, which was an electro-mechanical wired encyphering machine with a series of drums or wheels.
It was difficult to obtain the correct settings for the drums or wheels, so it was easy for the British to make mistakes when trying to account for Allied forces at the scene.