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    Re: Sextant and iPhone on the QM2
    From: Gary LaPook
    Date: 2013 Dec 4, 11:21 -0800
    You said you got fixes within .4 NM. Are you saying that all of your fixes were that accurate or that only your best ones were that close? I posted my experience doing the same kind of test that you did when I crossed the Atlantic on the Royal clipper, see:

    http://fer3.com/arc/m2.aspx/Accuracy-sextant-observations-sea-LaPook-sep-2010-g14008



    From: Nial McInerney <nialmac@gmail.com>
    To: garylapook@pacbell.net
    Sent: Saturday, November 9, 2013 2:28 PM
    Subject: [NavList] Sextant and iPhone on the QM2


    I recently crossed from NYC to Southampton on the Queen Mary and never having used a sextant on a big ship I brought a 3/4 size Simex and my iPhone along. I thought I would check my celestial against that device's GPS. I was surprised to find the ships location, course and speed updated every few minutes on the TV in the cabin. The cabin faced south, was right behind the bridge and on the same level, 190 above the waterline. I found it very, very easy to get good sights, not any different from using a sextant on the beach really but with a better defined horizon. Nowhere near as difficult as my small cruising sailboat and consequently got fixes within .4' of the positions reported from the bridge. This sextant isn't my favorite but is small, light, accurate and easy to pack inside a suit case. My iPhone has a few navigation apps on it, I like "SightCalc'" but I was disappointed to find the GPS stopped working about 800 miles into the journey and didn't pick up sat signals again until about 300 miles from the Western Approaches. Presumably the ship was picking up signals but of course it has millions of dollars worth of navigation equipment. I spoke to some officers coming off the bridge and they said they never used sextants and didn't even know if there were any aboard. Makes one feel like an idiot to be messing around with obsolete nonsense.
    Nial
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