11. VFR pilots primarily navigate by using the GPS, radio navigation systems, and most importantly pilotage. 12. Originally known as " LRN " for Loomis Radio Navigation , LORAN was invented by Loomis. 13. Larsson also wrote essays about radio, radar and radio navigation in Swedish and foreign journals. 14. Radio direction-finding is the oldest form of radio navigation . 15. The C-5 again became lost, this time over Newfoundland itself, when its radio navigation equipment malfunctioned. 16. During World War II, Eastham led the LORAN radio navigation development efforts at MIT's Radiation Laboratory. 17. Multilateration is a common technique in radio navigation systems, where it is known as hyperbolic navigation. 18. The maps they supply the pilots are constantly cross-checked and updated using ground-based radio navigation signals. 19. The Luftwaffe pioneered the use of distance-measuring radio navigation systems with their Y-Ger�t system in 1941. 20. This aircraft had not been completed and none of the radio navigation systems had been installed.
