Originally Posted by
iRaven
It might also explain why the US were happy to take MAD off of their P8s?
MAD is a very short range sensor. In WW2 Catalina with MAD had a range of about 400 feet. In the Straits of Gibraltar submarines entering the Med had to be no deeper than 330 feet. To detect submarines such submarines the aircraft had to fly at 50 feet.
MAD has improved but even so its range is still very limited in the order of approximately 1,200 metres. A fast moving submarine might be detected by MAD but move rapidly out of the detection zone.
Submarines can also hear aircraft so an aircraft conducting a MAD sweep can be avoided or evaded.