Speaking of OMEGA, there's a Navy training film from 1969 on Youtube[1] which explains some of the theory and is helpful in understanding where GPS came from.

Speaking of OMEGA, there's a Navy training film from 1969 on Youtube[1] which explains some of the theory and is helpful in understanding where GPS came from. [1] https://www.youtube.com/watch?v=7mFAemn1pSw https://www.youtube.com/watch?v=7mFAemn1pSw