From the APL Vault: Transit and the Birth of Satellite Navigation

When Sputnik was launched in 1957, two Johns Hopkins University Applied Physics Lab engineers listened to the radio beacon the Soviet satellite emitted as it circled the Earth -- and had an idea. That idea became Transit, the world's first satellite-based navigation system, developed at APL.

Видео From the APL Vault: Transit and the Birth of Satellite Navigation канала Johns Hopkins Applied Physics Laboratory