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    Re: Natural vs. Bubble Horizon LOP Plot Distribution
    From: Greg Rudzinski
    Date: 2012 May 5, 11:49 -0700

    During WW2 PBYs would land on the ocean to perform rescues. Using the Navy MK 5 with the natural horizon might have been used while on the water at sea level to get an accurate position for radio transmission.

    [NavList] Re: Natural vs. Bubble Horizon LOP Plot Distribution
    From: h.a.c. van Asten
    Date: 5 May 2012 11:17
    That might be the reason why early PanAm Pacific Clippers 1935-1940 had bubble sextants , and additionally marine sextants on board , not as a backup against mechanical failure of the bubble instruments as is sometimes stated , but for precision of observation on the natural horizon
    at low flying altitudes , or from sea level if the aircraft was occasionally emergency landed .

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