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單項選擇題

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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單項選擇題

（）is not a position-fixing system.

A.Hifix
B.Hyperfix
C.Trisponder
D.WGS84

單項選擇題

Which aid is NOT marked on a chart with a magenta circle? （）

A.Aero light
B.Radar station
C.Radar transponder beacon
D.Radiobeacon

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