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    Re: Another rhumb line puzzle
    From: Peter Hakel
    Date: 2011 Jun 5, 12:16 -0700
    I get a magnetic course almost exactly due east.

    Extrapolating the data at:

    I get:
    Lat: 84.8 N
    Lon: 119.7 W
    as the coordinates of the north magnetic pole in 2011.

    Great-circle distances from the magnetic pole to:
    NY: 2751.7 nm => magnetic latitude = 44.138 N
    VIE: 2745.3 nm => magnetic latitude = 44.245 N (almost the same as NY's)

    Initial great-circle courses from the magnetic pole to:
    NY: 130.572
    VIE: 40.110 ( ~ northeast… :-) )
    diff = 90.462 = change in magnetic longitude from NY to VIE

    I attach the calculation for the rhumb-line course from NY to VIE using these magnetic coordinates on input, resulting in:
    (magnetic) rhumb-line course = 89.9
    which is consistent with VIE's magnetic latitude being just a little higher than NY's.

    Peter Hakel

    From: Herbert Prinz <666@poorherbert.org>
    To: NavList@fer3.com
    Sent: Sun, June 5, 2011 12:34:14 AM
    Subject: [NavList] Another rhumb line puzzle

    I want to fly from New York, 40°38′23″N 73°46′44″W to Vienna. 48°06’39” N, 16°34’15” E. My autopilot is linked to a magnetic compass. Immediately after takeoff, I want to set the autopilot to the appropriate magnetic course and then not touch it again until I arrive. What is that course? (There be no wind through the entire flight.)

    Herbert Prinz

    40 38 23N 73 46 44W 48 06 39N 16 34 15E


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