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

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.

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

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（）.

In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.

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

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.

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.

Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.