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.

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

Radio beacon can be activated（）in case of distress.

Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）

SOLAS ships shall be equipped with（）.

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 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 advantage of geostationary satellites is（）.

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