Which of the following is NOT a function of sonobuoys in ASW operations?

Sonobuoys are specialized devices used in Anti-Submarine Warfare (ASW) for various functions primarily related to detecting and tracking submarines. Their main purpose is to enhance situational awareness and provide vital information for ASW operations.

While sonobuoys are excellent at detecting submarines through hydrophone technology and can also collect environmental data that can impact sonar performance, they primarily focus on sub-surface threats. Additionally, some advanced sonobuoys can relay information back to command, allowing for coordinated operations and tactical decision-making.

Tracking surface vessels, however, is not a typical function of sonobuoys. Surface vessels are generally monitored through other means such as radar, determined by their visibility from above the water. Sonobuoys are not designed for the specific role of tracking surface ships, making this function outside the scope of their intended use in ASW operations.