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    Re: gyroscopic compasses
    From: Nicol�s de Hilster
    Date: 2007 Jun 23, 12:37 +0200

    In respect to your question you might find the following article 
    I assume the type of compass you are referring to is better known as a 
    Fibre Optic Compass or Fibre Optic Gyro (FOG). One of the best currently 
    available is made by IXSEA. Their products can be found on: 
    The Octans is a gyro and attitude sensor, while the other products on 
    that page also incorporate positioning. An Octans is reasonable small, 
    but not really hand-held (28x14x15cm, 4.8kg). There is no display or any 
    other way to tell what the apparatus is doing other than by interfacing 
    it to a pc. The accuracy is stunning:
    heading: 0.2 x secants(latitude) degrees
    roll & pitch: 0.01 degrees.
    With a price in the region of 65.000,- euro's (I could be off by 15%) 
    this is not really an affordable piece of equipment, even in my business 
    (hydrography), but it is a joy to have it on board (I do use them at a 
    regular basis).
    I know that smaller and cheaper versions are available, but not by what 
    make and manufacturer. Maybe if you search the internet on Fibre Optic 
    Gyro you might find out more on those.
    Geoffrey Kolbe wrote:
    > Does anyone know of any "hand held" or "portable" gyroscopic compasses 
    > available? I would assume that laser gyroscopic compasses could be made 
    > quite small and - as there are no moving parts - be reasonably cheap if 
    > made in sufficient quantity.
    > Thanks
    > Geoffrey Kolbe
    > >
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