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    Re: Fluxgate compass /low end US vendor
    From: Brian Whatcott
    Date: 2002 Jan 31, 19:51 -0600

    At 12:24 PM 1/31/02, Jared Sherman wrote:
    >  < Trouble is, you need a FAST
    >  response to the tilting of the deck >
    >There are now solid-state accelerometers, literally you can buy a single
    >IC chip off the shelf that is a solid-state accelerometer capable of
    >generating data "instantly" for all three axes of motion. Among other
    >things they are used to track for inertial navigation systems. I don't
    >think they've replaced anything on the Polaris submarines, but they should
    >be more than adequate for generating correction data on a fluxgate compass.
    The low end of the market for a 3 axis magnetic sensor plus pitch and roll
    detection is probably this board level OEM module from Precision Navigation
    The tcm2-50  at  $770, still is not bargain priced - and the magnetic
    sensors are not exactly flux gates, and the high dollar strap-down
    rate-sensors and acceleration sensors are replaced by two "electrolytic"
    inclinometers which read out pitch and roll to +/- 50 degrees, but this is
    a step in the right direction, I'd think.
    (I was tickled to see their custom TIMEX watch offering with compass readout.
    Like the LCD-display compasses also shown on their site - these are low
    cost consumer grade items.)
    Brian Whatcott
       Altus OK                      Eureka!

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