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（）.
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（）.
单项选择题 Magnetic compass deviation（）.
