*giggle*
Marcus ... that's an aircraft transponder. Except for some vintage
1930's aircraft that don't have an electrical system - every plane /
helicopter has one. Hit Google or Yahoo! for "Mode-C" and "Mode-S"
transponder.
The ground radar "pings" the aircraft's transponder (interrogation). The
transponder sends back a reply. Some replies carry a 12 bit ID code plus
altitude. Others might have actual GPS coordinates.
-rick
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