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

（）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.

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

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

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