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Old 5th Mar 2015, 23:34
  #11650 (permalink)  
Ian W
 
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Originally Posted by ATC Watcher
My comment was not a speculation but a fact. The South Indian Ocean airpace is not the North Atlantic , and data link processing load is an issue for the Australian system, hence the trial.

But ADS-C (Automatic Dependent Surveilance - Contract) is addressable SATCOM, with up to 5 contracts that can be held concurrently. So you could have a contract with any agency worldwide, including your own dispatch. ADS-C cannot overload the air traffic service provider of the airspace the aircraft is flying in, if they are contracted to receive the ADS-C they merely have to store the data - a short data message every 15 minutes.. The South Indian Ocean Airspace is indeed different to the North Atlantic. It is extremely sparsely flown whereas the North Atlantic is ~2000+ flights a day.
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