In GMDSS Radio Logbooks, which statement is true about using abbreviations?

• A. Abbreviations are prohibited entirely
• B. They may be used only with supervisor approval
• C. They may be used only for certain vessel types
• D. Key letters or abbreviations may be used in GMDSS Radio Logbooks if their meaning is noted in the log

Answer: (D)

Abbreviations may be used in GMDSS radio logbooks as long as their meaning is noted in the log. This keeps entries concise while ensuring anyone reviewing the log can understand exactly what was recorded. The log needs to be legible and provide a complete history of communications, including who was involved and what actions were taken, so documenting what each abbreviation stands for prevents ambiguity. A common approach is to define abbreviations when they’re first used or maintain a small legend within the logbook so later readers can interpret them accurately. Abbreviations aren’t forbidden, and they don’t require supervisor approval or be limited to certain vessel types, as long as their meanings are clearly documented.