For "On-scene" communications, vessels in Distress and SAR Aircraft should use?

Correct Answer: Option B — VHF Ch-16, 4125 kHz J3E, 3023 kHz J3E

IMO and ITU regulations designate VHF Channel 16, 4125 kHz J3E, and 3023 kHz J3E as primary frequencies for on-scene SAR coordination. These frequencies ensure interoperability between maritime vessels and SAR aircraft, facilitating effective communication during distress incidents as mandated by the GMDSS operational requirements.