（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.

Please use（）for（）.

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

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

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.

The advantage of geostationary satellites is（）.

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

Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.

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.