（）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.

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.

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

SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.

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

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

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.

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

The vessel has stayed in port for seven days because she needs（）.

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