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    Re: Gyro sextant
    From: Bill Morris
    Date: 2015 Oct 21, 11:12 -0700

    The  Admiralty Research Laboratory at Teddington examined one and compared it with a Hughes bubble sextant and found it lacking. I have tried to upload my pdf file of the report to the NavList site but receive an upload error. I can't remember how I obtained the original file, but googling "gyro sextant admiralty" brings up one way.

    Here are the conclusions: 
    6, Conclusions.
    The gyro sextant in the form described is not considered
    satisfactory. Extreme care in handling is necessary and since the gyro
    line of sight is maintained in the horizontal by the resultant direction
    of gravity it is improbable that accurate results will be obtained on a
    rolling ship. The bubble sextant is more convenient and gives
    results of equal or better accuracy. Either type of Sextant should be
    capable of giving a fix at sea, under calm conditions, within one to
    three miles, and provided a large number of observations are made
    similar accuracy may be obtainable in a moderate sea

    Bill Morris

    Pukenui

    New Zealand

       
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