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post #3 of Old 12-22-2009
roline
Cal 9.2 SilverSwan
 
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The sound impulse travels around 4,870ft / second ( temp dependant). If the displayed dept is creeping a lot, it sounds like the internal clock reference is drifting. ~4.8 ft per milisecond.

Cal 9.2 #19 SilverSwan
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