How New Navigational Controls Help Submarines Prevent Underwater Collisions

How New Navigational Controls Help Submarines Prevent Underwater Collisions

Fly-by-wire controls on new Virginia-class submarines simplify the navigation process for human operators on U.S. Navy subs.

The recent undersea collision involving the U.S. Navy fast-attack submarine USS Connecticut in the South China Sea raises some questions about the value of integrated navigational technology used aboard submarines. 

The Seawolf-class submarines were conceived and designed in the 1980s as Cold War assets to defeat the most advanced Soviet submarines. The Navy planned to purchase twelve, but the end of the Cold War meant only three were ever built. Seawolf and USS Connecticut both entered service in the late 1990s.

Seawolf-class submarines and their immediate successors, the early Virginia-class boats, were not built with computerized or digital navigation systems. Starting with the Virginia-class’ Block III, newer boats are engineered with computerized fly-by-wire technology. This means key variables such as depth, speed, and descent can be regulated by computer automation to gather intelligence and map the ocean floor and, perhaps more importantly, prevent unwanted collisions. 

The mechanical and hydraulic controls of the Seawolf submarines are different than the computerized fly-by-wire joystick controls of the Block III and beyond Virginia-class boats. This collision may seem to lend further evidence in support of those now calling for a faster production and deployment tempo for high-tech Virginia-class attack submarines engineered with fly-by-wire navigation. While the circumstances of the collision are still unknown, it seems possible that more advanced navigational technology might be able to prevent or decrease the likelihood of collisions. 

The fly-by-wire system also allows the submarine to linger quietly in shallow waters with less human input. Human operators order depth and speed, but automated software can maintain the submarine’s course and depth.  This technology greatly expands the potential of submarines for intelligence, surveillance, and reconnaissance missions. The Seawolf-class, like earlier Los Angeles-class submarines, used manual controls.

Alexander Yachanin, then a graduate student at Stanford University, wrote in a 2016 research paper that the fly-by-wire system was one of the key differences in new submarines produced for the Navy.

“The most important feature for maneuvering in littoral waters is the fly-by-wire control system, whereby computers in the control center electronically adjust the submarine's control surfaces, a significant improvement from the hydraulic systems used in the Los Angeles-class,” he wrote.

Kris Osborn is the defense editor for the National Interest. Osborn previously served at the Pentagon as a Highly Qualified Expert with the Office of the Assistant Secretary of the Army—Acquisition, Logistics & Technology. Osborn has also worked as an anchor and on-air military specialist at national TV networks. He has appeared as a guest military expert on Fox News, MSNBC, The Military Channel, and The History Channel. He also has a Master’s Degree in Comparative Literature from Columbia University.

Image: Reuters.