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

COSPAS-SARSAT is intended to be used for（）.

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

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

Every lifeboat which is fitted with a fixed two-way vhf radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.

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

The priority of EGC messages is classified by（）.

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

The advantage of geostationary satellites is（）.

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