How does the searching vessel's radar interrogate a survival craft SART?

Official USCG Answer & Rule Citation

Correct Answer: Option B — The SART responds automatically when it detects the search craft or other vessels' X-Band radar signal.

Search and rescue operations rely on X-band marine radars (9 GHz / 3-cm) because SART units are specifically engineered to automatically detect and sweep in response to these exact frequency transmissions.

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