Which functions may the holder of a GMDSS Radio Operator License NOT perform on the Inmarsat-C equipment?

Correct Answer: Option A — Optimize performance by adjusting the transmitter EIRP.

Adjusting transmitter Effective Isotropic Radiated Power (EIRP) is a technical maintenance function that affects the station's compliance with regulatory emission limits. Only qualified technicians may perform such adjustments. Operators are limited to operational tasks like logging on, entering position data, and selecting Coast Earth Stations (CES) for traffic.