Page 37 - Electronic Navigation Cyber Book
P. 37

pressure is proportional to the speed at which the vessel moves. The
          pressure differentiator measures the differential pressure. The Controller
          unit converts the pressure difference into speed and distance units.






























          This type of log can give only speed through water and is greatly affected
          by  the  movement  of  the  water  which  would  induce  an  extra  pressure
          giving rise to error in readings.
































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