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.

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

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

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

The advantage of geostationary satellites is（）.

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

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

Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.

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

Please use（）for（）.