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    Aircraft Sextants
    From: Andrés Ruiz
    Date: 1999 Jul 29, 12:23 AM

    I'm wondering how good is an aircraft sextant for use on the sea. Has anybody used one?
    �
    In Celestaire catalog I've found:
    �
    NAVY MARK V SEXTANT (AN 5851-1)
    An extremely versatile sextant. It is particularly suitable for marine use, 
    can be used in aircraft; and is perfect for back yard practice. Its great 
    versatility lies in the fact that it is a combination marine and aircraft 
    sextant. As such, it utilizes both an artificial (bubble) horizon, and a 
    visible (sea) horizon.
    �
    The bubble horizon is most useful during periods of sea fog or darkness when 
    the sea horizon is obscured. Otherwise, the sextant functions exactly like an 
    accurate marine sextant.
    �
    The Mark V includes: a 2x telescopic optical path, a selectable astigmatizing 
    lens, and 4 sun filters. The elevation scale reads from -10� to +100�. A fine 
    scale micrometer drum indicates to 2 minutes of arc with interpolation easily 
    possible to within less than one minute. The sextant is made mainly of brass 
    and aluminum.
    �
    The MARK V was manufactured with some models incorporating a chronometric 
    averager. The averager records 60 different readings over a two minute period 
    and supplies an average reading. It was designed for use aboard aircraft 
    where accelerations produce erroneous bubble positions. Sextant weight with 
    the averager installed is 6 lbs., and without the averager is 4 1/2 lbs. 
    Because of the weight penalty, we recommend the non-averaging model for 
    marine use.
    The Sextant comes in freshly, overhauled condition, with comprehensive 
    instruction manual, and calibration report. It does not, however, come with a 
    carrying case.
    �
    Navy Mark V with Averager #1502 $900
    Navy Mark V without Averager #1503 $750
    
    
    �
    Andr�s
    http://www.geocities.com/CapeCanaveral/Runway/3568/index.html
    e-mail: aruiz{at}orona.es
    
    

       
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