If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.

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

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

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

SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.

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 vhf radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.

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

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.

Please use（）for（）.