单项选择题

A low HDOP (Horizontal Dilution of Precision) number such as 2 indicates a （）.

A.poor fix
B.good fix
C.poor signal quality
D.good signal quality

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单项选择题

A list signal of one white light indicates that the vessel is （）.

A.on an even keel
B.listing about 1° to the side the light is displayed on
C.listing over 5° With the light displayed on the high side
D.listing，and the chutes should be directed to the side where the light is displayed

单项选择题

A list man would expect to see any of the following light signals except （）.

A.two red lights
B.one green light
C.one white light
D.one amber light

单项选择题

A line of position from a celestial observation is a segment of a （）.

A.circle of equal altitude
B.parallel of declination
C.parallel of altitude
D.vertical circle