Which of the following methods will give a GMDSS Radio Operator the best indication of whether ARQ communication can be established with a coast radio station?

Correct Answer: Option C — Monitor the coast radio station's "free signals" and call on the frequency on which the loudest and most consistent signals are heard.

ARQ (Automatic Repeat Request) requires a stable, two-way link. Monitoring the coast station's idle or "free" signals allows the operator to assess signal-to-noise ratios and propagation conditions on specific frequencies. Selecting the strongest, most consistent signal ensures the highest probability of successful phasing and reliable data exchange between the ship and shore.