How many frequencies are available under GMDSS for DSC Distress-related calls?
Official USCG Answer & Rule Citation
Correct Answer: Option D — Seven
GMDSS utilizes a total of seven dedicated DSC distress frequencies: one on MF (2187.5 kHz) and six across the HF maritime bands (4, 6, 8, 12, 16, and 18/22 MHz bands). VHF Channel 70 operates separately for local DSC alerting.
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