A view of the Cape Hatteras lighthouse from the beach. (National Park Service) I started to feel a little nostalgic when I found out that the first SOSUS signal of a Soviet diesel submarine was detected by the Cape Hatteras Naval Facility (NAVFAC) on June 26, 1962. SOSUS was accurate enough to locate a submarine within a circle no wider than 100 kilometers. That's a large area, but depending on the quality of the contact, the circle might be reduced up to ten kilometers.

First SOSUS signal at Cape Hatteras – June 1962. Examples of hydrophone arrays include the Sound Surveillance System (SOSUS) , which is a set of fixed hydrophone arrays on the seafloor, and the US Navy towed array known as the Surveillance Towed Array Sensor System (SURTASS) . Hydrophone arrays are used to locate submarines, track marine mammals, and even to study global climate change by detecting temperature differences.

By combining all of the hydrophone element signals with predefined phase lags for each element based on their relative locations and local sound speed, an acoustic "beam" can be formed, oriented in any direction. Friday, June 22, 2018 3:21 PM . By Naval Institute Archives. The major drawback of the system was that it did not cover deepwater areas more than 500 kilometers from the edge of the continental shelf.

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