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    Is this quite the thing or not?
    From: Dan Allen
    Date: 2002 Nov 5, 11:30 -0800

    Simrad has a new product with two GPS receivers in one instrument for
    added redundancy.  Of course if the GPS system goes down this
    redundancy does nothing for you.
    
    Anyway, here is their simple description of the device: what does the
    group think of it?  Are their claims justified?  Does anyone know what
    it is doing -- the carrier phase data?  In the spirit of having
    multiple ways of tracking your position (GPS, dead reckoning, celestial
    nav), it may be a big step backwards as it claims to replace a
    gyrocompass.  It is this aspect that I am particularly interested in.
    
    --- From the Simrad website: ---
    
    The HS50 replaces several vessel instruments, such as a gyrocompass,
    GPS navigator and speed log in one compact navigation package. In
    addition the HS50 provides added position redundancy with two complete
    GPS receivers.
    
    Precision heading is derived from the fixed-distance dual GPS antenna
    arrangement in the Sensor Unit, using carrier phase data to generate
    heading information independent of latitude and vessel dynamics. GPS
    position and velocity are calculated from both of the two antennas,
    which gives total redundant position and velocity sources in this
    product.
    
    DGPS signals may be input to the HS50 to improve position and velocity
    accuracy. The inertial rate element provides yaw information. In case
    of short GPS outages, the inertial rate sensor automatically takes over
    as the prime source for heading determination until the GPS comes back
    on line. The rate element and GPS� are working together seamlessly to
    insure accurate, continuous and robust heading information even when
    the vessel is sitting still.
    
    ---
    
    See http://www.simrad.com/ for more details.
    
    Dan Allen
    
    
    

       
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