What is the most appropriate action for a GMDSS Radio Operator to take in a distress situation where immediate help is needed, but the vessel is not sinking nor needs to be abandoned?

Correct Answer: Option D — Transmit Distress call by MF/HF, VHF or INMARSAT.

GMDSS procedures require the use of MF/HF, VHF, or Inmarsat systems to transmit a distress alert when immediate assistance is required. This ensures the alert reaches the appropriate Rescue Coordination Center (RCC) and nearby vessels, as mandated by SOLAS Chapter IV regarding radiocommunications for distress and safety.