What is a primary function of an active sonobuoy?

An active sonobuoy's primary function is to transmit acoustic pulses. These devices are deployed typically by aircraft or ships and are designed to enhance anti-submarine warfare capabilities. When an active sonobuoy is deployed, it sends out a series of sound waves (acoustic pulses) into the water. These sound waves travel through the water, and when they encounter objects such as submarines, they are reflected back to the sonobuoy. By analyzing the time it takes for the sound waves to return and the characteristics of the echoes, operators can determine the distance and direction of submerged objects, making it an essential tool in maritime operations for tracking and locating submarines.

In this context, transmitting acoustic pulses directly relates to its function in detecting submarines, while the other options involve functions that are not the primary purpose of an active sonobuoy.