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sonar
Sea Songs for Landlocked Sailors was created in 1999.
A)to find the depth of the sea b)the sonar device measures the time taken by the ultrasonic sound to travel from the ship to the bottom of the sea .
the density of sea increases with depth
no human can live in the depth sea
SAILORS!
no human being can live on the depth sea
Echo sounding measures the time it takes a sound wave to hit the sea floor and return, knowing the speed of sound in water allows a depth to be calculated, if you have an existing depth map and a GPS , any differences between the map and your reading, could indicate a shoal of fish has sent back a false depth reading.
The depth of a submarine under the sea means how many feet below the surface of the sea it is.
great sailors
Sailors call long sea journeys by sea "Voyages"
sailors measure distances at sea in nautical miles