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

Please use（）for（）.

（）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.

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

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

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

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

SOLAS ships shall be equipped with（）.

Ship-to-ship distress alerting should be conducted by（）.

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