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Thread: Abbreviation G/S

  1. #1
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    Default Abbreviation G/S

    Hi all,

    I would like to ask if anyone knows meaning of this RAF abbreviation.
    I got it from some article written by navigator and is some kind of navigational term:

    "Very numerous winds were found, but all of them from D/R (Dead Reckoning) positions and track and G/S, which makes their correctness rather doubtful."

    Any ideas much appreciated

    TIA


    Pavel
    Czechoslovak Airmen in the RAF 1940-1945
    http://cz-raf.webnode.cz

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    Ground Station(s)?

    A

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    Ground Speed

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    My guess would be ground speed.
    Dave Wallace

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    Default

    Hi chaps, many thanks now it looks simple - it must be ground speed.
    May I have one more question from the same navigational text:

    ANT?

    "he could have used loops and ANTs" - for getting FIX.

    TIA

    Pavel
    Last edited by CZ_RAF; 25th March 2009 at 21:56. Reason: typo
    Czechoslovak Airmen in the RAF 1940-1945
    http://cz-raf.webnode.cz

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    Perhaps ANT'S means Antenna as in Radio Antenna or Radar Antenna.

    Just a thought. Ties in with getting a FIX ie a bearing.
    Regards Scott McIntosh

    ACIA Researcher

    Search for Air Crash Investigation & Archaeology on Facebook for our groups page.

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    Loop shaped antennae are used for obtaining a fix from a reciever, sometimes they are used together with "regular" shaped fixed antennae. The loop is rotated by the navigator turning a hand crank, and the signal strength varies, being a maximum when the loop opening is pointed directly at the transmitter (or maybe at 90 degrees to the transmitter, I forget which right now). The fixed antennae is used to make sure the signal strength variation comes from rotating the loop, and not from some other factor (like atmospherics, or something happening at the transmitter). Today that is all done automatically, perhaps back then you had to monitor strength from both the loop and the fixed antenna to get a valid reading.

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    Interesting they would question the validity of their wind data as at the very least the wind component should be accurate assuming their track and groundspeed information was correct. ie. headwind, tailwind, drift.

    A loop antenna is a type of antenna which I am guessing would have been in service during the war.

    Eric

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    Looking again at the first quote, G/S most probably means ground speed. The navigator was trying to calculate winds, which requires air speed and aircraft bearing, plus ground speed and track made true. If his ground speed and track are based on dead reckoning, as he stated, the calculated wind can only be as accurate as his dead reckoning. Most navigators, then and now, have a healthy distrust of dead reckoning, because it is so easy to screw up.

    Been there, done that.

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    Sorry Bill, did not realize you were posting the full explanation while I was typing.

    Eric

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