During WWII, Allied warships used ASDIC (an early, crude form of Sonar), airplanes (some ships carried recoverable seaplanes), and visual lookouts (binoculars) to spot submarines and direct attacking vessels to the contact.
World War I submarines were primarily used to locate and attack surface cargo and warships.
sonar hydrophones
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.
Type your answer here... ASDIC
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.
US PBYs and escort carriers were able to locate and destroy enemy subs in the Atlantic.
Sonar was used widely in World War II in an effort to locate enemy submarines. It wasn't as sophisticated as it is today, but it did help. Actual numbers are difficult to come by, but sonar was effective in the successful attacks on several submarines.
A sub spotter is typically called a Submarine Sonar Technician or Sonar Operator. Their role is to detect and locate enemy submarines using sonar technology.
Firstly locate the auto-attack feature in your Spellbook. It should be in the General section. Go into combat with a creature and find the auto-attack button in your book. If it is flashing red that means auto attack is on and you need to press it to turn it off.
They use their senses to locate where you are, and violently bite you on the back like it would treat a prey. A snakehead can also kill you.
Dolphins use echolocation to communicate with each other. Bats use it so they dont fly into things like trees. Boats and submarines use it to locate where each other are so they can fire bombs at one another.
They use sonar to find the enemy. Passively, they listen for the sounds of the other ships, which will give them a bearing to the target. Active sonar will ping the enemy and provide a range as well.