I never knew subs were outfitted with electronics to detect airbored radar.
Some were even in the Second World War. German U-Boats had detectors nickmaned 'Biscay Crosses' which could detect meter-length radar. Unfortunately for the Germans, one captured Allied airman told them that Costal Command aircraft could detect emmisions from it and so they lost confidence in it.
USN subs had radar detectors in the latter part of the Pacific War when Japanese ships started turning up with radar. My only accuracy Gripe with the old Silent Hunter game was that it didn't have them in.
While the battles the British fight may differ in the widest possible ways, they invariably have two common characteristics – they are always fought uphill and always at the junction of two or more map sheets.
General Sir William Slim