By using（）system a ship can send a distress message and know with certainty it will be received.

The rescue coordination center may（）on stations which interfere with traffic.

What following is not among the function of SOLAS ships?（）

Ship-to-ship distress alerting should be conducted by（）.

Radio communication（）for many years and helps to save tens of thousands of lives.

Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.

Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）

For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.

The frequency（）the safety message will be transmitted shall be included in DSC safety call.

On-scene communications will normally take place between（）.