All coast radio stations（）DSC installed for VHF and HF.

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

（）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.

In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.

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（）.

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.

SOLAS ships shall be equipped with（）.

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

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