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.

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

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.

Before GMDSS, if the radio officer on board is serious ill,（）.

If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.

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

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

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.

（）will form the basis for distress alerting and safety calling.

（）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.