What is the functional design of a SART?

The functional design of a SART (Search and Rescue Transponder) is specifically to emit a homing signal for search teams. This device is critical in search and rescue operations, as it responds to radar signals emitted by rescue vessels or aircraft. When a radar signal is received, the SART transmits a series of pulses back to the radar, which helps rescuers quickly identify the location of the distressed vessel. The signals create a distinct pattern on the radar screen, making it easier for search teams to pinpoint their position in challenging conditions.

The other options, while they may relate to safety or communication, do not accurately represent the primary function of a SART. For instance, creating a visual alert for nearby ships is not the primary role of a SART; it is designed for radar detection rather than visual signaling. Providing weather updates is outside the scope of SART functionality, as it's focused strictly on signaling for rescue. Lastly, while signaling the need for immediate rescue captures the essence of urgency, it does not convey how a SART operates or the technology behind it, which is centered on radar transmission.