What is the operational mode of CASS Sonobuoys?

The operational mode of CASS (Common Active Sonobuoy System) Sonobuoys is to remain quiet until they are commanded to operate. This design allows the sonobuoys to conserve resources and avoid detection by adversaries until they are activated by the operating aircraft.

When deployed, CASS sonobuoys do not continuously transmit data or sonar pulses, which would make them more easily detectable. Instead, they are in a low-power standby mode, awaiting specific commands from the aircraft to start their sonar operations. This tactical advantage aligns with the need for stealth and efficiency in underwater surveillance and anti-submarine warfare operations.

The other options describe operational behaviors that do not apply to how CASS sonobuoys function. For instance, continuously radiating sonar pulses or perpetually transmitting data would compromise the element of surprise and increase vulnerability, while the notion of being exclusively used with LOFAR technology does not reflect the diverse applications of CASS sonobuoys beyond that particular system.