The so-called quadrangle sonar positioning method was the first method that the United States created to prevent foreign nuclear submarines from invading.
It was a method that used anti-submarine aircraft and anti-submarine destroyers to drop sonar equipment in the sea area to form a quadrangle square sonar.
The range was huge and could reach up to 300 nautical miles.
As long as a foreign submarine entered the square-shaped range, it could be detected. Even the most advanced submarine stealth technology would lose its effectiveness in the square-shaped range.
Moreover, because of the huge size of the nuclear submarine, its speed would be relatively slow. Even if the United States went to have afternoon tea first, the foreign nuclear submarine would not be able to leave the square-shaped range of 300 nautical miles.
However, this sonar positioning method also had its drawbacks.
