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

Radio beacon can be activated（）in case of distress.

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.

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

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

The advantage of geostationary satellites is（）.

Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.

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

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.

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