Lamyl_hhlco From United States of America, joined Aug 2000, 621 posts, RR: 2 Posted (11 years 5 months 3 weeks 4 days 19 hours ago) and read 2974 times:
I was just wondering for a pilot flying an old 747-2 or a DC10 that is not equiped with FMC/ FMS or GPS to easy a straight flight Navigation, how is the Navigation made over the ocean or how did they do during the 70's and 60's?
Is there any NAVAID or specific equipment?
Air2gxs From , joined Dec 1969, posts, RR:
Reply 1, posted (11 years 5 months 3 weeks 4 days 19 hours ago) and read 2941 times:
In the early 60's (a little before my time) they proabbly used an Omega system. This is best explained as a land based GPS. Several transmitting stations around the world transmitted a signal in the Low Frequency or Very Low Frequency range (can't remember which). The receiver would receive these signals and triangulate position.
In the late 60's to the present aircraft use INS (Inertial Navigation System) or IRS (Inertial Reference System). This is a independent system that measures the movement of the aircraft in order to update its position. All you have to do is tell it where its starting from.
Cessna172RG From United States of America, joined Aug 2000, 749 posts, RR: 0
Reply 3, posted (11 years 5 months 3 weeks 4 days 18 hours ago) and read 2887 times:
This "Omega" system...would that not be Loran? Like, Loran A or B? I don't think Loran C was out at that time, as my father, a charter boat operator in the early 70s, started using Loran A at that time, and 10 years ago he bought his last Loran C equipment. Now he navigates by GPS, it's really neat around Cape Flattery and going between Tatoosh island and the mainland, aka "the slot." Just like IFR flying. Can't see a thing but you know that there are a bunch of rocks around you. Sorry, got off the forum topic...not aviation related, but navigation nonetheless.
AAR90 From United States of America, joined Jan 2000, 3522 posts, RR: 45
Reply 6, posted (11 years 5 months 3 weeks 4 days 2 hours ago) and read 2717 times:
Early 60's Pan Am 707s started service using celestial navigation, doppler and later Loran. Introduction of B747 brought with it the triple-INS. Early 80's saw the advent of Omega followed closely (almost simultaneously) by FMS/IRS and finally GPS in the 90's.
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