Incoming!

[Puster Bill]

Originally Posted by GoldenRivet

u-boats were equipped with such a device as well.

it was called "TAG".

It was installed in the control room of the XXI and was set to listen for pre-determined high pitched prop sounds, if one of these pre-programmed sounds was heard, a warning would sound in the u-boat would alert the crew.

I would imagine the allied system was very similar.

That device is what I consider to be "proof" that the germans knew about the FIDO.

I find it hard to believe that a device that had a 25% success rate wasn't noticed by hydrophone operators, and then reported to BdU, by the boats that survived.

[Jimbuna]

Originally Posted by Puster Bill

That device is what I consider to be "proof" that the germans knew about the FIDO.

I find it hard to believe that a device that had a 25% success rate wasn't noticed by hydrophone operators, and then reported to BdU, by the boats that survived.

A smal problem being that FIDO was generally used on boats that were in crash dive mode and probably not in the best position to be 'listening'

[Steeltrap]

Peter Cremer in U-333: The Story of a U-Boat Ace asserted the Germans knew nothing of FIDO until after the war. Given his operational experience plus posting at BdU, one would think he would know.