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

（）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.

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

Before GMDSS, if the radio officer on board is serious ill,（）.

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

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

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

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.

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