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（）.

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

The distance between the surface of the water and the tidal datum is the （）.

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

Above-normal tides near the center of a hurricane maybe caused by the （）.

An occulting light is one in which （）.

On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.

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

Clearance gauges at bridges indicate （）.

The Earth’s irregular heating is caused by （）.