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    Re: 1973 Altitude Correction tables
    From: John D. Howard
    Date: 2018 Mar 31, 12:18 -0700

    David,

    Regarding Chichester and Norfolk Is.

    I flew the Pacific in the early 1970s using mostly CelNav ( well, my navigator used CelNav ) and with 10 NM or so error we landed at small, low islands like Wake or Canton.  With the height of Norfolk Is. I think Chichester could have been 30 or more miles off and still seen it.

    I spotted Norfolk a good 50 NM or more flying from Sydney to Pago Pago but was much higher, about 28,000 feet.

    Doing CelNav solo, without autopilot, his precision could not have been fine - 10 or 20 minutes arc would be my guess.

    G. LaPook has done cel shots from small airplanes and would know more than me.  My experence was from jets at higher altitude.

    John H.

       
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