The meaning of ebb tide is that （）.

For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.

The Earth has the shape of a(n) （）.

A vessel is entering port A for the first time and has a Pilot conning the vessel. The Master is unsure that the Pilot is taking sufficient action to prevent a collision. What should the Master do（）.

During a period of whiteout，you should expect which of the following（）.

The height of a light is measured from which reference plane?（）

As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.

The distance between any two meridians measured along a parallel of latitude （）.

In Admiralty Sailing Directions，bands is the word used to indicate（）marking．

Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.