Hello Kpt. Lehmann,
thanks for your answers. I just realized i did not tell at all how much fun this GWX is !
I just felt somehow inclined to write about my experience with GWX in the 1939 to 40 years. It occurred to me that a visual sighting at the described distance 8+ miles with the following quality of an attack was not possible in reality - at that time an american lend-lease four-stacker would have been virtually blind (and i presented a low profile, running silent at PD with less than 100 rpms when he was still 7 miles away). Remember he already shelled me at 10 or more miles distance, when i did not see him at all.
A direct question: What kind of detectors does a four stacker have in GWX in mid-1940 ? A hint referring to the respective file is enough.
Concerning the link you gave - i also answered in this thread what the original poster might have done wrong to be detected - only to show here i am not completely inexperienced

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There is no doubt that the GWX "mod", or better total conversion made a very good sim out of the vanilla version. But it seems - as you wrote - that some basic programming cannot be altered. Well, but i did not experience this behaviour in the vanilla version, so this must have changed due to GWX, hence my comments.
I believe you that this is survivable, however the tactics you need here are harder than in reality, at least in the early war - this is from comments as well as from the books i read. I have no problem with that, just learn other tactics, it is a sim after all.
The propaganda thing. There are some recently published books and TV media suggesting the "Allies" (not even distinguishing between US and British actions) knew and used all the technology, like convoys, and reacting to an attack, right from the beginning of the war, and that Radar and Sonar was used from day one, on most ships. Maybe this is what german history channel or Mr Knoop is about lol. Would this be true the U-boats would never have had the possibilities and chances they had and used until 1942. Germany lost the war for all kinds of reasons, not only at the technological front.
In my opinion this is said to (try to) explain why the US did not react to the U-boat threat at all in the first war years. They would not even have run convoys had not the British command insisted. As well a lot of British war intelligence was wasted or better not wanted to be heard by the US. Seems someone is in need of an explanation here.
Thanks and greetings,
Catfish