Lines drawn through points on the Earth having the same atmospheric pressure are known as （）.

An inflatable liferaft is hand-launched by（）.

Important changes to charts and lights（including temporary ones），radio signals and sailing directions are listed in（）.

To predict the actual depth of water using the Tide Tables，the number obtained from the Tide Tables is（）.

Mean high water is the average height of（）.

After jacking down your liftboat you have an unexpected list.You find that the only cause of this list must be a flooded leg.Your next course of action should be to（）.

An inflatable liferaft should be manually released from its cradle by（）.

Admiralty EasyTide（）.

Aboard a survival craft，ether can be used to（）.

The program of graphical predictions of height against time for a period of up to seven consecutive days is contained in（）.