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.

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

The priority of EGC messages is classified by（）.

For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.

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

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

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

The advantage of geostationary satellites is（）.

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

（）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.