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

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

International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.

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

The advantage of geostationary satellites is（）.

SOLAS ships shall be equipped with（）.

On-scene communications will normally take place between（）.

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

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

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.