🔍 Key Concepts

• Search and Rescue Transponder (SART) purpose and how it works with 3-cm (X-band) radar • Difference between EPIRBs, SARTs, and AIS-SARTs in terms of what feedback they give survivors • What kind of indication (visual/audible) is required for survivors to know SAR units are detecting them

💭 Think About

• Which device in the options is specifically designed to respond to 3-cm (X-band) radar interrogation from approaching rescue craft? • Do EPIRBs or AIS-SARTs normally change their own behavior to tell survivors about radar detection, or are they primarily for satellite/GPS/AIS reception by others? • Think about what feedback a traditional SART gives in the survival craft when it is being painted by a nearby X-band radar—how would survivors know it is happening?

✅ Before You Answer

• Verify which equipment is defined in SOLAS as a Search and Rescue Radar Transponder (SART) and what kind of indication it must provide to survivors when interrogated • Check whether an EPIRB or AIS-SART is specified to change its pattern or alarm due to radar interrogation, or if that’s not part of their function • Focus on the choice that mentions 3-cm radar interrogation and a visual or audible cue to people in the survival craft