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    Re: C.Plath Yachtsman Sextant
    From: Stephen N.G. Davies
    Date: 2017 Mar 13, 09:21 +0800
    Thanks all for those replies - and to Bill Morris for the low down on the Freiberger. I don’t think my yottigation ever tested for high accuracy. Mine was used on 33’ and 30’ yachts racing offshore which bounce around in the mildest chop, so hardly ideal platforms for precision observations. Landfalls after 600 miles were always good to within <5 miles, so good enough, and if that’s what the sextant was designed for, then it did the job.
    S

    Dr Stephen Davies
    c/o Department of Real Estate and Construction
    EH103, Eliot Hall
    University of Hong Kong

    Office: (852) 2219 4089
    Mobile: (852) 6683 3754 

    stephen.davies79---.com
    daiwaisi{at}hku.hk


    On 13 Mar 2017, at 7:28 AM, Bill Morris <NoReply_Morris@fer3.com> wrote:

    Stephen, I reviewed the Freiberger yacht sextant's structure here: https://sextantbook.com/?s=Freiberger+yacht+sextant. There are one or two maintenance issues and the horizon shades are at risk when returning it to its case. There is nothing to choose between the fields of view, but I have a preference for half silvered horizon mirrors, as in the Plath instrument, rather than the full silvered mirrors of the Freiberger, for reasons explained in the blog post. I haven't calibrated my Plath yacht sextant (it came to me without its box) but I am prepared to bet that Mr Plath would not have let it out of the factory with the errors that the Freiberger has, though for yachting use they probably don't much matter.

    Bill Morris

    Pukenui

    New Zealand

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