Which of the following service or maintenance functions may NOT be performed by the holder of a GMDSS Radio Operator License?

Correct Answer: Option C — Any adjustments or maintenance that may affect the proper operation of the station.

GMDSS Radio Operators are restricted to operational tasks. Any maintenance or adjustment that could affect the technical performance, frequency stability, or power output of the radio station is strictly prohibited for operators. Such tasks must be performed by a qualified GMDSS Maintainer to ensure compliance with FCC technical standards.