船舶在轻雾中航行，应抓（）为点，运用罗经，稳住航向，摆正船位，勤测勤算，做好应变的准备。

A、岸形

B、航标

C、显著物标

D、以上都对

Coast Pilots and navigational charts are kept corrected and up-to-date by using the（）.

A.pilot charts

B.Notices to Mariners

C.Tide Tables

D.Current Tables