Which of the following statements is true about GMDSS logbooks?

• A. Key letters or abbreviations may be used in GMDSS Radio Logbooks if their meaning is noted in the log
• B. Abbreviations are prohibited
• C. Only full phrases may be written
• D. Symbols can replace words without explanations

Answer: (A)

In GMDSS logbooks you can use key letters or abbreviations to keep entries concise, as long as you note their meaning somewhere in the log. This ensures that anyone reviewing the log later can understand what was recorded without needing lengthy phrases each time. The important point is that the acronym or shorthand must be defined within the log or in a referenced legend so there’s no ambiguity. Abbreviations aren’t prohibited, and you don’t have to write only full phrases. Likewise, symbols aren’t allowed to replace words without explanations, because readers must be able to interpret them unambiguously.