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

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

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

Radio communication（）for many years and helps to save tens of thousands of lives.

The priority of EGC messages is classified by（）.

Radio beacon can be activated（）in case of distress.

（）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.

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

Please use（）for（）.

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