What maintenance function may the holder of a GMDSS Radio Operator license perform, or supervise the performance of, on an Inmarsat-C SES?

Correct Answer: Option B — Remove stack deposits and other debris from the radome preventing degraded performance.

GMDSS Radio Operators are permitted to perform basic maintenance that does not affect the technical integrity or transmission parameters of the radio equipment. Cleaning the radome of soot or debris is an authorized operator task, as it ensures optimal signal propagation without requiring specialized technical certification or internal equipment adjustment.