单项选择题

（）is on the panel of DF.

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

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单项选择题

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

单项选择题

As a vessel changes course to starboard，the compass card in a magnetic compass（）.

A.remains aligned with compass north
B.also turns to starboard
C.first turns to starboard then counterclockwise to port
D.turns counterclockwise to port

单项选择题

You have calibrated your RDF. When compiling the calibration table，the correction to be applied to any future RDF bearings is listed against the（）.

A.true bearing of the transmitter
B.relative bearing of the transmitter
C.heading of the vessel
D.time of reception