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    Re: Expedition Amelia
    From: John D. Howard
    Date: 2019 Oct 23, 20:10 -0700


    I am no expert, but let me chime in.  AE and Noonan had a drift meter and drop flares, so easly could measure the wind - using doubble drift.  For daytime, they had alumumn power bombs to put a spot on the ocean for drift sights. As you know Noonan could use cel-nav to get a speed line and a course line so DR would have not been too far off - for an experenced navigator.

    As for the quality of RDF at 2000 miles - not worth a crap.  I flew world wide in the seventies, before GPS, and used ADF alot.  Over the ocean a strong radio would give a good RDF for at most 500 miles, but because thunderstormes and other weather events throw off the bearing we would not rely on a RDF more than maby 200 miles.  Rember, a bearing from a RDF is a great circle, so maps showing straight bearings thousands of miles long are way off.

    John H.    retired USAF and airline captain.

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