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

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

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

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.

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.

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

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.

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

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

As each MSI message will have a unique identity, the printing of messages already received correctly is（）.