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Depth finder (sonar)
When buying a depth finder what you should look for depends on which of the four varieties you're buying because they're all used for different activities. It should have a GPS tracker and sonar but other features vary by use.
Yes sonar can be used at periscope depth. Surface ships also have sonar arrays on them. They are usually used to detect submarines.
'Sonar". And determines depth. The ocean floor topography can be mapped by 'sonar scanning'.
You use Sonar
With sonar
a small device sending sonar waves to find fish.
SONAR
Sonar.
sonar
Scientist use the device "Sonar."
To find out the ocean`s depth