Yes sonar can be used at periscope depth. Surface ships also have sonar arrays on them. They are usually used to detect submarines.
sonar,is used to map mid-ocean ridges:]
Sonar can be used to locate large shoals of fish.
Sonar was used to detect and hunt submarines in WW2
sonar is a device used underwater for locating submerged objects and for submarine communication by means of sound waves.
Most people do not hear the sonar signals used by animals, such as bats or dolphins.
the Challenger
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sonar
it is used for sea to operate the bottom of the ocean
Sonar stands for "sound navigation and ranging." It is a technique used for detecting and locating objects underwater by sending out sound waves and analyzing the echoes that bounce back. Sonar is commonly used in navigation, fishing, oceanography, and military applications.