Plain English Meaning

A way for aircraft to talk to people on the ground by sending signals through satellites in space, instead of using regular radio. This works almost anywhere in the world, including over oceans where normal radios can't reach.

Full Definition

A communications system that uses orbiting satellites to relay voice and data between aircraft and ground stations, providing coverage in remote and oceanic areas where traditional VHF radio range is unavailable. On an ICAO flight plan, SATCOM capability is indicated by specific equipment codes that tell ATC the aircraft can be contacted via satellite link.