How can a GMDSS operator determine the best frequency band to choose for a SITOR transmission to a shore station?
Official USCG Answer & Rule Citation
Correct Answer: Option C — Listen to shore station "free signals" and choose the band with the strongest signal.
The most reliable method for selecting a SITOR frequency is to monitor the shore station's 'free signal' or idle broadcast. By listening to the signal strength and quality on various bands, the operator can empirically determine which frequency is currently providing the best propagation path for the existing atmospheric conditions.
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