Preferred channel buoys indicate the preferred channel ……

单项选择题Lighted white and orange buoys must show which color light?（）

A.Orange
B.White
C.Red
D.Alternating yellow and white

单项选择题In plotting a running fix，how many fixed objects are needed to take your lines of position from? （）

A.Three
B.Two
C.One
D.None

单项选择题At the magnetic equator there is no induced magnetism in the vertical soft iron because（）.

A.the lines of force cross the equator on a 0°-180°alignment
B.the quadrantal error is 0°
C.there is no vertical component of the Earth's magnetic field
D.the intercardinal headings have less than 1°

单项选择题A vessel’s position should be plotted using bearings of（）.

A.buoys close at hand
B.fixed known objects on shore
C.buoys at a distance
D.All of the above

单项选择题A single line of position combined with a dead-reckoning position results in a(n)（）.

A.running fix
B.fix
C.estimated position
D.assumed position