Well, regarding the upload speed limit of 15K/sec (and download speed limit of ~400K/sec), it depends where you stay. I use to have those limits in Québec city, but since i've moved to Montréal, i get sustained 710K/sec download and 75+ K/sec upload. Hooray!
Radar altimeters are usually not used "en route", but only during final approach. They are of little use when the airplane is over 2000 feet AGL, witch is basically all the flight except take-off and landing.
By communicating with the Air Traffic Controller, who gives him that information. Also, the ATC receives altitude information for an airplane trough the airplane transponder, wich calculate the altitude from the uncalibrated air pressure, the calibration being done in the ATC computer, ensuring the same calibration for every aircraft within is scope...
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Well, regarding the upload speed limit of 15K/sec (and download speed limit of ~400K/sec), it depends where you stay. I use to have those limits in Québec city, but since i've moved to Montréal, i get sustained 710K/sec download and 75+ K/sec upload. Hooray!
Radar altimeters are usually not used "en route", but only during final approach. They are of little use when the airplane is over 2000 feet AGL, witch is basically all the flight except take-off and landing.
By communicating with the Air Traffic Controller, who gives him that information. Also, the ATC receives altitude information for an airplane trough the airplane transponder, wich calculate the altitude from the uncalibrated air pressure, the calibration being done in the ATC computer, ensuring the same calibration for every aircraft within is scope...