Which channel is designated for GMDSS Digital Selective Calling?
Official USCG Answer & Rule Citation
Correct Answer: Option D — Ch-70
VHF Channel 70 (156.525 MHz) is internationally designated under ITU Appendix 18 and IMO GMDSS standards exclusively for digital selective calling (DSC) for distress, urgency, safety, and routine operational alerts. Voice communications are prohibited on this dedicated watchkeeping frequency.
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