单项选择题
A.in high latitudes B.near the equator C.on north or south headings D.on intercardinal headings
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
A.true bearing of the transmitter B.relative bearing of the transmitter C.heading of the vessel D.time of reception