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- Master (Oceans or Near Coastal (Uninspected Fishing Industry Vessel)) »
- Q182 - Navigation General: Near Coastal
215. Which is TRUE of echo-sounders?
Echo-sounders measure the depth of water below the keel, providing critical under-keel clearance information for navigation. The instrument determines depth by measuring the time it takes for a sound pulse to reach the bottom and return, with most installations calibrated to display depth relative to the keel.
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