If you have the OTF mod also loaded, there is an extensive pdf explaining how the radar is supposed to work, the German and the US one. This also applies for TMO I think.
It's called "Using Radar.pdf".
In brief, early on in your campaign you cannot switch on the A-Scope and you don't have surface radar. But your SD radar works anyway by getting you crew reports about spotted airplanes that you must follow on the map - not on the scope. In TMO you can raise/lower the SD antenna at periscope depth to locate planes which you should do in a battle area. (Don't forget to lower it again, although I don't think this is a factor for visual detection by the enemy AI.)
XS
Last edited by XenonSurf; 04-29-20 at 07:21 PM.
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