You may notice that tracking is more sporadic. This is because ADS-B is ground-based, over the water we rely on ADS-C and ACARS, which is satellite-based. An example below is from one of the hobbyists that feed satellite signals to ADSBExchange. The one in the back has been picking up signals for the current flight, this is a California-based ground station. In about 2 hours we will be picking up a signal from the UK one.

@elonjet Hej, I'm running ADSB-B to #Adsbexchange. Do you have some pointers how to extend to ADSB-C and how to feed?

@Morgennebel @elonjet
Contrary to ADS-B which is broadcast by the airplane, ADS-C is transmitted only on request (about every 10mn or so) and goes over inmarsat, I believe it would be rather complicated to listen in...

@sxpert @elonjet This exact thread starts with a picture of satellite dishes and the term hobbyists feeders. I am only asking how can I do the same...

@Morgennebel @elonjet you'd need to build something like the NSA was using in the 80's (remember ECHELON ?) to decode the inmarsat traffic, which then may be encrypted