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    Re: Researchers spoof GPS signals to alter superyacht'scourse
    From: Bill B
    Date: 2014 Apr 29, 14:49 -0400

    On 4/29/2014 2:21 PM, Peter Smith wrote:
    > Hear, hear! for the trusty hockey puck
    > (http://www.celestaire.com/compasses/mini-2000-compass-detail.html)
    
    I would not leave shore without my hockey puck, and IMHO the Mini 2000
    is the best of the lot. If memory serves at the time I purchased mine
    Celestaire carried two hockey puck compasses. I was fortunate enough to
    chat with Ken in Celestaire's booth at a Chicago's Strictly Sail show,
    and the Mini 2000 was his recommendation. I bought it on the spot and
    have never looked back.
    
    I've used it along with a sextant 17 miles off Chicago. In one set I
    used the horizontal angle between 2 skyscrapers determined with the
    sextant and a bearing to one from the compass. In another I used
    vertical height above the horizon with a modified refraction value along
    with a compass bearing.  The results compared to GPS position were so
    good it was almost scary. In one set I used height above horizon and a
    bearing (true) from the GPS, and it was worse than the compass
    observations; perhaps because the GPS is limited to 1 degree resolution
    and on a good day the hockey puck can do better than that.
    

       
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