COSPAS-SARSAT is intended to be used for（）.

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

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

The vessel has stayed in port for seven days because she needs（）.

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.

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

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.

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

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

In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.