Sonar
They were used by submarines to navigate when not in open waters, They were also used by submarines and anti-submarine ships to locate enemy submarines.
Because it's impossible to navigate properly without one.
Submarines use echolocation to detect, locate, and avoid obstacles underwater, as well as to navigate their surroundings. By emitting sound waves and analyzing the echoes that bounce off objects, submarines can map their environment in conditions where visual navigation is limited or impossible.
Very sophisticated inertial guidance systems. Combined with occasional satnav validations.
This sounds like it's probably the sonar system of a submarine.
Naval submarines do not dive deep enough to go near underwater mountains. This is contrary to what you may have seen in the movies. They use sounding charts to determine the depth of the water in which they are navigating. They avoid such underwater objects. Research submarines use cameras and sonar, as well as charts, to guide them.
There are quite a few devices that have made sea exploration as you know it possible. Submarines are one of these devices.
1. Ballistic submarines 2. Attack submarines
Boats, Subs, Submarines, Home.
Yes, North Korea has submarines
Submarines - poem - was created in 1917.
One of our Submarines was created in 1982.