Inmarsat had previously decided to offer a free tier of their existing satellite data service to allow ADB-C (Contract) where position, velocity, intent, and me

Inmarsat had previously decided to offer a free tier of their existing satellite data service to allow ADB-C (Contract) where position, velocity, intent, and meteorological data are sent based on events, schedules or requests http://www.inmarsat.com/press-release/inmarsat-provide-free-global-airline-tracking-service/ http://www.inmarsat.com/press-release/inmarsat-provide-free-... http://code7700.com/ads-c.html http://code7700.com/ads-c.html ADS-B (Broadcast) instead is broadcasting continuously on 1090MHz for reception by other aircraft and ground stations. Globalstar require an additional piece of hardware to be added to each plane to then rebroadcast these signals onto their network http://www.globalstar.com/en/index.php?cid=6300 http://www.globalstar.com/en/index.php?cid=6300 On the other hand, Aireon is going for the most ambitious option and the one this radio spectrum agreement relates to - launch new space based hardware on the Iridium NEXT satellites http://aireon.com/services/global-air-traffic-surveillance/ http://aireon.com/services/global-air-traffic-surveillance/