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

The advantage of geostationary satellites is（）.

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.

（）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.

The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.

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

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（）.

The frequency（）the safety message will be transmitted shall be included in DSC safety call.

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