Mean high water is the average height of（）.

A person who sees someone fall overboard should（）.

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

A man aboard a vessel，signaling by raising and lowering his outstretched arms to each side，is indicating（）.

A vessel in distress should send by radio telephone the two tone alarm signal followed immediately by the（）.

After being rescued from the vessel accident，the people agreed that they had much to（）.

The Lists of Meteorological Observation Stations can be found in（）.

Light Lists for coastal waters are（）.

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

An orange flag showing a black circle and square is a（）.