Explanation: When ship's power and the GMDSS console fail, the vessel has lost its primary means of communication and distress alerting. Option A correctly identifies the essential backup procedures. An **EPIRB (Emergency Position-Indicating Radio Beacon)** is designed to be self-sufficient and automatically transmit a distress alert, containing vessel identification and position, to rescue authorities via satellite. Concurrently, a **Survival Craft Transceiver (SCT)** is a portable VHF radio specifically for emergency use. A "Mayday" call made via the SCT on **Channel 16** is the international voice distress frequency, alerting any nearby vessels or shore stations listening. Option B is incorrect because UHF transceivers have extremely limited range and are not designated for international maritime distress alerting. Options C and D are incorrect because a voice "Mayday" call is *never* made on Channel 70. Channel 70 is exclusively reserved for **Digital Selective Calling (DSC)** distress alerts. While a DSC radio would initiate a digital alert on Ch-70, a voice call follows on Ch-16. Channel 06 is a working channel, not a primary distress channel.