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Radar consists of bouncing radio waves off distant objects (such as aircraft) and processes their reflection.  Sometimes radar "tracks" are misread in the excitement, as in the American shooting down of Iran Air Flight 655 in 1988, killing all of the 290 passengers and crew aboard.  That airplane was within Iranian territorial waters but approaching the American Navy.

Radar consists of bouncing radio waves off distant objects (such as aircraft) and processes their reflection.  Sometimes radar "tracks" are misread in the excitement, as in the American shooting down of Iran Air Flight 655 in 1988, killing all of the 290 passengers and crew aboard.  That airplane was within Iranian territorial waters but approaching the American Navy.