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單項選擇題

A compass card without north-seeking capability that is used for relative bearings is a(n)（）.

A.bearing circle
B.pelorus
C.bearing bar
D.alidade

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單項選擇題

（）is on the panel of DF.

A.RINGS INT
B.SWEEP INT
C.REPEATER
D.GONIOMETER

單項選擇題

Quadrantal error in a gyrocompass has its GREATEST effect（）.

A.in high latitudes
B.near the equator
C.on north or south headings
D.on intercardinal headings

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