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    Re: Winter Sextant Sight Accuracy?
    From: Trevor Kenchington
    Date: 2002 Jan 11, 6:01 AM

    Jared Sherman asked:
    
    > But not to digress...the basic question was and still is, what kind of
    > position accuracy is anyone else getting with winter sextant sights at
    > lattitudes above 40� ?
    
    On a Nova Scotian beach (latitude just shy of 45 North) under winter
    conditions, I expect to get a position within one mile, using a plastic
    sextant -- given care to allow the instrument to cool to air temperature
    while exposed to the Sun (thus allowing it to equilibrate with the
    combination of air temperature and radiant heat).
    
    However, mirage effects can distort the apparent position of the
    horizon. My one attempt to take sights across an ice-covered harbour, in
    bright sunlight and with a low height of eye, produced spectacular
    errors!
    
    
    Trevor Kenchington
    
    
    --
    Trevor J. Kenchington PhD                         Gadus{at}iStar.ca
    Gadus Associates,                                 Office(902) 889-9250
    R.R.#1, Musquodoboit Harbour,                     Fax   (902) 889-9251
    Nova Scotia  B0J 2L0, CANADA                      Home  (902) 889-3555
    
                        Science Serving the Fisheries
                         http://home.istar.ca/~gadus
    

       
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