The two different types of sonar are passive and active.
It was Lewis Nixon who invented the very first sonar-type listening device in 1906.
SONAR is an acronym created by the navy that is the name of what they use to locate items under water. But if you wanted to, you could say the bats using echolocation on land is a type on SONAR. They basically both use sound to locate objects so they are really not very different at all.
HUMSA is a advanced sonar
Sonars were used to detect any objects that got into the detection field of the sonar. By this, the military could detect enemy submarines etc., which they couldn't see normally because of the opacity and/or darkness of the water.
Sonar uses sound waves to detect objects underwater. It is a type of acoustic wave that travels through the water and reflects off objects, allowing for the measurement and mapping of underwater environments.
STS1 is my old rate/rank, and one of the best in the Navy if you're on a fast-attack submarine. The STS stands for "Sonar Technician (Submarines) - the 1 is the rank, for First Class Petty Officer. Submarine and Surface Sonar Techs have different rate designations, as their school training pipeline is different. Surface Sonar designation is STG, for Sonar Technician(Guns).
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A special type of radar called sonar is used to detect objects underwater by emitting sound waves and detecting their reflections. Sonar is commonly used in applications such as navigation, communication with submarines, and mapping the ocean floor.
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