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Old 04-20-2001
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Raytheon ST-60 instruments

Check its installation. Is it installed near the centerline and foreward of the keel? If it is on the side of the keel it will be affected by heel angle and turbulance eratically. Also how do you know it is reading eratically and not reflecting you actual speed through the water? Also check you averaging function which if it is set to average not frequently enough can give very bizarre readings.
Good luck
Jeff
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