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.

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

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

Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.

The advantage of geostationary satellites is（）.

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

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

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

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