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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:
    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
    e-mail: aruiz@orona.es

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