🔍 Key Concepts

• SART (Search and Rescue Transponder) frequency and what type of radar it is designed to respond to • Difference between aircraft radar and shipborne X‑band (9 GHz) radar in GMDSS context • Typical activation/response conditions for a SART in the GMDSS system

💭 Think About

• Ask yourself: Is a SART designed to work with any radar that can see it, or is it built for a very specific radar band? • Consider which of the options introduces extra conditions (power, height, range) that are not part of the basic SART operating principle. • Think about whether a single, simple design requirement (like a specific radar band) would be more practical globally than multiple complex conditions.

✅ Before You Answer

• Verify which radar frequency band SARTs are standardized to respond to under GMDSS (usually expressed in GHz). • Check whether aircraft radars used in searches are normally operating in the exact same band as standard shipborne X‑band navigational radars. • Confirm whether the regulation or manual for SARTs mentions detailed conditions like minimum radar power, antenna height, or range as part of the basic "active mode" trigger, or just one key technical condition.