At what distance can a SART be detected by aircraft, equipped with a 3cm radar, flying at approximately 3,000 feet ?

Correct Answer: Option D — approximately 40 miles

Operating on X-band frequencies (3 cm), a Search and Radar Transponder (SART) can be detected by aircraft radar at approximately 40 miles, assuming proper altitude and line-of-sight propagation, complying with SOLAS Chapter IV standards for survival craft equipment.