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Trans-Oceanic Navigation Prior To GPS  
User currently offlineEWRvirgin From United States of America, joined May 2001, 358 posts, RR: 2
Posted (13 years 2 months 3 weeks 3 days 22 hours ago) and read 3349 times:

With the lack of navaids over water, how were trans-Atlantic and trans-Pacific flights navigated prior to the installation GPS equipment in A/C?

7 replies: All unread, jump to last
 
User currently offlineSCXmechanic From United States of America, joined Dec 1999, 534 posts, RR: 1
Reply 1, posted (13 years 2 months 3 weeks 3 days 22 hours ago) and read 3306 times:

One word...

OMEGA

It used several ground stations based around the world and transmitted a low freq signal that was used for Long Range Nav. But wasn't very accurate and could easily have been distorted by solar flares. Its since been decomissioned by the Navy (I think thats who ran the system as it was used by surface ships too)


User currently offlineJT-8D From United States of America, joined Dec 2000, 423 posts, RR: 3
Reply 2, posted (13 years 2 months 3 weeks 3 days 15 hours ago) and read 3283 times:

Dont forget loran. We had a few 727s with a little periscope looking thing in the cockpit ceiling to use a sextant with..JT

User currently offlineModesto2 From United States of America, joined Jul 2000, 2791 posts, RR: 5
Reply 3, posted (13 years 2 months 3 weeks 3 days 8 hours ago) and read 3270 times:

I got another word (or acronym)...

INS

Intertial navigation system. Punch in coordinates at gate and with a system of accelerometers, it tracks the aircraft's movement. Even now, aircraft use an IRS (inertial reference unit) that is similar to the INS to back up the GPS.


User currently offlineJT-8D From United States of America, joined Dec 2000, 423 posts, RR: 3
Reply 4, posted (13 years 2 months 3 weeks 3 days 8 hours ago) and read 3261 times:

Well, your right to a point. The irs does more than provide position data. On our planes, the fmc position is the "accepted" position. It gets data from the gps, and irus. It will update its position from gps, but not from iru. Irus main job is provide output to instruments (hsi, adi, vsi,)..JT

User currently offlineTimT From United States of America, joined Jun 2001, 168 posts, RR: 0
Reply 5, posted (13 years 2 months 3 weeks 1 day 20 hours ago) and read 3224 times:

The airline I work for uses Inertial Navigation on some of the planes. The INU has 2 accelerometers and a clock. It all runs off of an internal computer/database and then updates within 150 miles of a DME site. The DME's usually read in pairs and like a 90degree angle. It calculates the position and updates. The accelerometers are sensitive enough to read the earth's rotation. We havin' fun yet??


User currently offlineL-188 From United States of America, joined Jul 1999, 29795 posts, RR: 58
Reply 6, posted (13 years 2 months 3 weeks 1 day 18 hours ago) and read 3220 times:

Most airliners still had a navigator on them untill the early 1970's when the first INS units became available. I belive Flying Tigers laid there navigators off about 74.

All you need is a star chart and a Sextant.

The Air Navigators license is still on the FAA books. I have know idea where you would go and get one though.

It would be a neat license to have though. Anybody know where they still teach a course in it?



OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
User currently offlineKellmark From United States of America, joined Dec 2000, 691 posts, RR: 8
Reply 7, posted (13 years 2 months 3 weeks 1 day 8 hours ago) and read 3206 times:

The military.

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