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

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

At last，the palm trees that fringe the natural harbor of Port Aloahoa come into view on the horizon lit by the setting sun.The meaning of this sentence is that （）.

The height of eye correction is smaller than geometrical dip because of （）.

Due to lapse of time the risk in these areas to surface navigation is now considered （）than the ordinary risks of navigation，but a very real risk still exists with regard to anchoring，fishing or any form of submarine or seabed activity.

On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.

Clearance gauges at bridges indicate （）.

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 Earth has the shape of a(n) （）.

An occulting light is one in which （）.