单项选择题
A chart position enclosed by a square is a（n）（）.
A.fix
B.estimated position
C.dead reckoning position
D.running fix
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（）is not a position-fixing system.
A.Hifix
B.Hyperfix
C.Trisponder
D.WGS84 -
单项选择题
Which aid is NOT marked on a chart with a magenta circle? （）
A.Aero light
B.Radar station
C.Radar transponder beacon
D.Radiobeacon -
单项选择题
When using a Lambert conformal chart in high latitudes，angles such as bearings are measured in reference to （）.
A.the meridian through the object of the bearing
B.the meridian through the ship's position
C.the meridian midway between the ship and the object
D.any meridian
