Which statement about using key letters in GMDSS Radio Logbooks is true?

Using key letters in GMDSS Radio Logbooks serves an important purpose in ensuring that all entries are clear and well understood. The correct statement is that their meanings must be explained in the logbook. This requirement is crucial as it promotes clarity and transparency in communications, especially in distress situations or during routine operational reporting.

By elaborating on the meanings of these key letters, anyone reviewing the logbook—whether it be an authorized personnel, investigators, or regulatory bodies—can accurately interpret the information recorded. This is particularly vital since logbooks can hold critical data regarding ship operations, safety communications, and emergency responses. The practice prevents misunderstandings that could arise from ambiguous abbreviations or codes, thereby enhancing the safety and effectiveness of maritime communications.

In contrast, if the meanings were not provided or left unexplained, it could lead to confusion or misinterpretation of records, particularly in critical situations. This emphasizes the importance of clarity and adherence to established communication protocols within the GMDSS framework, ensuring that all operators maintain consistent and reliable log entries.