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sonar
The modern tools includes several forms of sonar(detection by sound reflection).
Sonar
They use a Sonar system.
Scientsts use sonar to map the depth of water in sea and river etc..,they also use sonar to locate and identify object underwater
So that the city could easily keep an array of ships and boats. Boats are used for a great many things, from fishing to trading to exploring new lands, etc. Without the use of boats, we would not have many of the things we use today, and without a harbour, using boats would have been too difficult for many cities.
Do boats use sonar. Yes they do.
I like to swim underwater.
Didn't is a combo of Did and Not so you can use it when your saying you did nto do somthing, you didn't do somthing .
Dolphins use echolocation to communicate with each other. Bats use it so they dont fly into things like trees. Boats and submarines use it to locate where each other are so they can fire bombs at one another.
The best tool to use to measure distance underwater is
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