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

（）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.

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

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

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

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

As each MSI message will have a unique identity, the printing of messages already received correctly is（）.

Every lifeboat which is fitted with a fixed two-way（）radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.

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.

The advantage of geostationary satellites is（）.