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    Re: Magnetic variation changing faster than anticipated
    From: John D. Howard
    Date: 2019 Feb 28, 16:09 -0800

    Tony,

    The 45 d left - 90 d right - 45 d left was common and I used it when I was in the US Air Force.  You do need a drift meter.  Called double drift and was in the Air force manual.  You would get true wind and could figure ground speed and true course.  On a long flight it would add about 2 minutes to the enroute time.  

    The airplane I flew, C-141, did not have area nav ie. INS or GPS untill the early 1980's when at last we got double INS units, but they took out the sextant port and the navigator.

    John H.

       
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