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.

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

At least two two-way VHF radiotelephone apparatus shall be provided on every cargo ship of（）tons gross tonnage and upwards but less than 500 tons gross tonnage.

Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.

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

What following is not among the function of SOLAS ships?（）

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

（）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.

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