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.

SOLAS ships shall be equipped with（）.

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

（）will form the basis for distress alerting and safety calling.

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

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（）.

Every lifeboat which is fitted with a fixed two-way vhf radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.

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

Before GMDSS, if the radio officer on board is serious ill,（）.