A.the lines of force cross the equator on a 0°-180°alignment
B.the quadrantal error is 0°
C.there is no vertical component of the Earth's magnetic field
D.the intercardinal headings have less than 1°
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A.buoys close at hand
B.fixed known objects on shore
C.buoys at a distance
D.All of the above
A.running fix
B.fix
C.estimated position
D.assumed position
A.true north
B.magnetic north
C.the vessel's beam
D.the vessel's head
A.estimated position
B.fix
C.running fix
D.dead-reckoning position
A.dead reckoning position
B.estimated position
C.fix
D.None of the above
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In very high latitudes，the most practical chart projection is the（）.
The recording fathometer produces a graphic record of the（）.
（） is a circular traffic lane used at junctions of several routes，within which traffic moves counterclockwise around a separation point or zone.
The four standard light colors used for lighted aids to navigation are red，green，white，and （）.
You have been informed that dredging operations may be underway in your vicinity.Which buoy indicates the dredging area（）.
（） is a defined area within which ships must use particular caution and should follow the recommended direction of traffic flow.
When latitude and longitude are used，these shall be expressed in（）（and decimals of a minute if necessary），north or south of the Equator and east or west of Greenwich.
When entering from seaward，a buoy displaying a single-flashing red light would indicate （）.
When approaching a preferred-channel buoy，the best channel is NOT indicated by the（）.
Depiction of TSS's on charts uses（）as the primary color.