Submarines have sonars.
To detect underwater mines and submarines.
By an electronic device called 'sonar' .
The development of radar helped detect underwater submarines.
Sonar. Active and passive
they use sonar like bats do to detect objects that are in their path
Modern naval ships use some form of Sonar to detect submarines. Additionally, some ships are equipped with Magnetic Anomaly Detectors (MAD gear) that detect a submarine's impact on the Earth's magnetic field in that area. The gear is typically carried aboard helicopters temporarily stationed on the ship.
They are mapped by sonar. The same technology they use to detect submarines from battleships / carriers.
sound wavers are affected by propellers
Sonar was used to detect and hunt submarines in WW2
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In 1915, Paul Langévin invented the first sonar type device for detecting submarines called an "echo location to detect submarines" using the piezoelectric properties of the quartz.