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

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

Areas enclosed by a long and short dashed magenta line indicate （）.

The period at high or low tide during which there is no change in the height of the water is called the （）.

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（）.

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

Clearance gauges at bridges indicate （）.

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

A vessel not to impede the passage of another vessel is not relieved （） taking collision-avoiding action.

Lateral movement of the vessel to leeward of its course defines （）.