61I1 A
 Which action must be taken to ensure that incoming message traffic of all priority levels will be received through Inmarsat-C?
A. The GMDSS Radio Operator must log-in to the desired satellite (if the unit did not automatically do so).
B. No additional action is necessary after turning on the receiver and aiming the antenna at the desired satellite.
C. The system needs only to be commissioned and turned on.
D. The GMDSS Radio Operator must log-in to the desired satellite and receive the message reference number (MRN) from the LES.
