GMDSS operators should learn which of the following propagation "rules of thumb"?

Correct Answer: Option C — Longer distance = higher frequency, Shorter distance = lower frequency, Daytime = higher frequency, nighttime = lower frequency.

Under USCG National Maritime Center examination standards, the accepted correct answer is: Longer distance = higher frequency, Shorter distance = lower frequency, Daytime = higher frequency, nighttime = lower frequency..