You can add the FuMB37XXIII mod for Schnorchel-Radar-receiver combination, it is provided in the NYGM3_New add-on as an optional , what i understand is that if you add the mod you will not be able to use the type XXI anymore, instead the mod also enables a type XXIII , check the "NYGMManual2_4&2_5" and the "FuMB37XXXIII readme" .pdfs that are provided in the documentation section of the NYGM3_New folder .
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