Where would you find information about the time of high tide at a specific location on a particular day of the year?（）

Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.

Full details of all lights and fog signals are shown on（）.

（）is on the panel of radar.

Shipboard Emergency Drills must be carried out at least（）on board cargo ship.