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View Diary: How Airliners Work - Navigating the Oceans (75 comments)

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  •  you left out LORAN-C (3+ / 0-)
    Recommended by:
    sawgrass727, ColoTim, PeterHug

    http://en.wikipedia.org/...

    LORAN was an American development, advancing the technology of the British GEE radio navigation system that was used early in World War II. While GEE had a range of about 400 miles (644 km), initial LORAN systems had a range of 1,200 miles (1,930 km). It originally was known as "LRN" for Loomis Radio Navigation, after Alfred Lee Loomis, who invented the longer range system and played a crucial role in military research and development during World War II, but later was renamed to the abbreviation for the more descriptive term. LORAN systems were built during World War II after development at the Massachusetts Institute of Technology (MIT) Radiation Laboratory and were used extensively by the US Navy and Royal Navy. The RAF also used LORAN on raids beyond the range of GEE.[4]
    I flew to asia several times, the Older PanAM 747's had a LORAN-C but they didn't use it much preferring INS. The speeds they flew at, LORAN-C wasn't real accurate.  They'd have to take a reading, start a stop watch, hold a constant heading, then figure out how far they had travelled from the fix point
    •  I never realized (3+ / 0-)
      Recommended by:
      BlackSheep1, ColoTim, PeterHug

      That LORAN-C had that kind of range.

      If the pilot's good, see, I mean if he's reeeally sharp, he can barrel that baby in so low... oh you oughta see it sometime. It's a sight. A big plane like a '52... varrrooom! Its jet exhaust... frying chickens in the barnyard!

      by Major Kong on Sat Jun 22, 2013 at 07:35:13 PM PDT

      [ Parent ]

      •  Atlantic coverage (0+ / 0-)

        http://en.wikipedia.org/...

        granted a Skywave fix might only give a best case fix of 2 NM and be subject to disruption from solar flares,  
        you had pretty good 1/4 mile fix accuracy as you got with LOS of the stations,  which is about 200 miles.

        now you probably couldn't chart a fix using the tables, maps and time data flying at 0.9 mach,  but with an automatic
        Loran station, it was probably fast enough to crank out
        a decent fix, especially with a magentic heading input and
        air speed input.

        you may want to talk to some of the old timers and discuss
        LORAN for aircraft and boating, and update your article.

    •  There was also a system called OMEGA developed (1+ / 0-)
      Recommended by:
      PeterHug

      primarily for the use of US ballistic missile subs to fix their position, then use primarily INS from that point on.  There were commercially available OMEGA receivers for aircraft (very expensive).  OMEGA was a very-low-frequency system to allow the radio waves to penetrate the ocean surface so the subs didn't have to surface and risk satellite detection.

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