Automatic disaster beacons???

Organization: George Mason University, Fairfax, Virginia, USA
Date:         10 Apr 96 02:17:43 
Followups:    1
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I just saw the movie 'Alive' yesterday and was horrified that at the
primative use of search plane to try to visible find the airplane wreck.

Aren't planes equiped with automatic disaster radio beacons which will
transmit in the event of an emergancy?  Since when were these implemented
if they exist, and if they don't exist, why not?  How expensive could a
small radio in a crash container cost?

If an airplane does indeed crash, what it used to find its position?  Is
there any possibility of 'alive' reoccuring?

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