| Which maintenance functions can a GMDSS Radio Operator perform? |
| A) The Operator is responsible for ensuring that INMARSAT antennas are free of built-up soot and clear of obstacles. |
| B) All levels of maintenance must be performed by a licensed GMDSS Radio Maintainer. |
| C) The Operator may install an EPROM in order to ensure that the equipment continues to operate within legal constraints. |
| D) The Operator can make fine internal adjustments to the transmitter as long as the output power does not change by more than one percent. |
