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

（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.

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 frequency（）the safety message will be transmitted shall be included in DSC safety call.

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.

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.

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

Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.

COSPAS-SARSAT is intended to be used for（）.

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