How far can a SART's signal be detected by radar when interrogated?

A SART, or Search and Rescue Transponder, is specifically designed to enhance the capability of search operations by providing a detectable signal via radar when interrogated. When activated by an appropriate radar signal, a SART transmits a series of pulses that create distinct blips on the radar screen, making the SART's position identifiable to search and rescue vessels or aircraft.

The standard range for the SART's signal detection when interrogated is indeed up to 5 miles under ideal conditions. This range can be influenced by various factors such as the environment, sea state, and the specifications of the radar equipment used to interrogate the SART. It is essential to understand this distance, as it can significantly impact the rescue operation's effectiveness.

Other distances mentioned in the options exceed the operational limits of SART technology. For example, a SART signal cannot be reliably detected at 10 or 15 miles, which means that while those signals might seem plausible, they do not align with the SART's technical specifications and capabilities. Hence, the correct choice reflects the optimal performance range of a SART when called upon in distress situations.