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

We consider（）send a helicopter with medical facilities to the distress area.

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

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

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.

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.

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

Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.

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

International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.