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

SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.

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

Please use（）for（）.

SOLAS ships shall be equipped with（）.

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

Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.

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

At least two two-way VHF radiotelephone apparatus shall be provided on every cargo ship of（）tons gross tonnage and upwards but less than 500 tons gross tonnage.

As each MSI message will have a unique identity, the printing of messages already received correctly is（）.