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    Re: Removing Deviation from the Ship's Magnetic Compass
    From: Gary LaPook
    Date: 2013 Aug 15, 13:52 -0700
    Have you seen this before, quadrantal correctors in the shape of cylinders instead of balls? I was aboard the battleship IOWA yesterday and saw them mounted on a binnacle that was located aft of the superstructure, apparently an axillary steering location. The Flinders bar was mounted aft of the binnacle which makes sense considering the location of the binnacle. The first photo is taken facing aft. The cylinders are about a cubit long.

    Something I hadn't realized before, but it makes perfect sense now, is that the steering station on the bridge is surrounded by sixteen inches of armor with just slits for viewing outside. The armor is shaped in a huge cylinder about 10 feet in diameter on the inside.


    From: Greg Rudzinski <gregrudzinski@yahoo.com>
    To: garylapook@pacbell.net
    Sent: Tuesday, August 6, 2013 9:44 AM
    Subject: [NavList] Re: Removing Deviation from the Ship's Magnetic Compass

    The next time you are on the hook. Have the cadet observe the swing of the magnetic compass during a tide change and or wind shift. Throw in a low Sun azimuth by telescopic alidade. If you still have that trusty NC 2 then compare the great circle calculation to a distant nav aid or point of land to protractor and chart visual interpolations.
    Greg Rudzinski
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