Which of the following channels and modes should be used when initiating a Distress alert transmission?
Official USCG Answer & Rule Citation
Correct Answer: Option D — Ch-70 DSC
VHF Channel 70 (156.525 MHz) is the exclusive international frequency dedicated solely to digital selective calling for distress, urgency, and safety alerts. Radiotelephony channels like Channel 16 or Channel 6 are used only for follow-on voice communications after the initial DSC alert.
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