With all of our modern technology why doesn't all of the A380 & 747 planes have a simple prototype of a GPS that will broadcast the?

airplanes exact location to satellites in real-time from the moment of take-off till landing (in an airport or a crash landing in an ocean)

This will be MUCH CHEAPER then the $ ($500 million+) that is spent trying to locate the wreckage of airplanes in the vast ocean.
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