Quote:
Originally Posted by Peanut
So this statement from the article is incorrect?
But over longer distances where radar coverage is limited – ie usually when planes are flying across oceans – they use another system, Automatic Dependent Surveillance. Here the aircraft transmits its own signal and gives its position via satellites. Maclean says: "Once you go outside primary radar coverage, which would normally be about 100 miles offshore maximum, you are relying on the plane to be transponding."
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Admittedly I didn't read the article, apparently that part of the world still has somewhat stoneage radar coverage and rely on satellites to track the transponders.
Sorry, I was responding when you said
"if the transponder was "turned off" and they went to an altitude under 29,000 feet, they would not have been visible to radar?"
I find it bizarre the radar systems over there only do 1 minute pulse looks for tracking high allitude aircraft.