What is Pythagoras Error of Echo Sounder?

  • This occurs when a ship uses separate transmitters for transmission of the sound pulse and reception of the echo.
  • The transmitters are physically separated on either side of the keel or separated along the length of the keel.
  • The depth measured at the E/S will be the slanted depth and not the direct below the keel depth.
  • In deep waters, this error will not matter much but in shallow waters there will be considerable over reading which is dangerous.


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