Did the Japanese have Hedghogs?

[Admiral Halsey]

Originally Posted by Bubblehead1980

Hmmm MAD was just a detection device from what I understand, worked pretty well on the USS Halibut in November 1944. Plane using MAD pinpointed her location, dropped some bombs and called escorts in.

I've heard about a device that Japan used that was like what he described but I don't remember what is was called. Either way I doubt you can replicate it in SH4.