Page 36 - Electronic Navigation Cyber Book

This type of log can give only speed through water and is greatly affected
by the current flowing under the ship.

THE PRESSURE TYPE LOG (PITOT TUBE LOG)

This type of log consist of
1. Two openings outside the hull of the ship, static tube that provides
static pressure and impact or Pitot tube that measures dynamic
pressure or the water flow of pressure

2. Controller unit (pressure differentiator)

3. Speed and distance transmitter
4. Speed and distance recorder

Operations

The opening of the Pitot tube faces forward so that when the vessel
moves forward, the water causes a pressure at the tube this dynamic
© 2018 Digital Galaxy Index 36