What is the primary function of a CASS sonobuoy?

The primary function of a CASS (Communications and Acoustic Sensor System) sonobuoy is to remain quiet until commanded to ping. This capability allows for effective and strategic deployment in anti-submarine warfare. By staying silent, the CASS sonobuoy can evade detection by enemy forces, ensuring that it can be activated at an opportune moment to gather acoustic data on potential submarine activity. When the command is given to ping, the sonobuoy emits sound waves into the water and listens for their echoes, which helps to identify and track underwater objects.

This operational mode is particularly valuable in a tactical environment, where surprise and the element of stealth can lead to successful monitoring of submarine movements. The ability to operate in a dormant state until needed means that the CASS sonobuoy can conserve energy and maintain its effectiveness for longer durations, which is critical in many naval operations.