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.

The rescue coordination center may（）on stations which interfere with traffic.

The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.

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

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

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.

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

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

The advantage of geostationary satellites is（）.