27:15

The Navy Navigation Satellite System (1967)

51:05

GEE - WWII Hyperbolic Navigation System

17:23

LORAN for Ocean Navigation

22:51

Tektronix - Transmission Lines

21:34

TACAN TRAINING VIDEO

28:48

1967 Navy Satellite Navigation; IBM 7094; AN/UYK Computer History Archives

24:15

オメガ鉄塔建設工事の記録（1996 3）24'15

31:23

Scientists Found a WWII Submarine in Arctic Ice — What They Discovered Inside Shocked the World