Re: Scary - DaLo
Nope, I mean a floating device that gets ejected only when the plane goes underwater. The problem with the standard beacon is, as in the case of the MH370, you have to have a good idea of a location to start with and trawl with a boat to find it.
A combination of a flashing strobe, passive radio reflector, trail of dye and an active transmitter would work fine.