A.NM
B.Ship's Routing
C.Colreg
D.Solas
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A.Set
B.Frequency
C.Period
D.Function
A.bottom contour only up to depths of 100 fathoms
B.depth underneath the keel against a time base
C.contour of the bottom against a distance base
D.depth of water against a distance base
A.Along the magnetic equator
B.Connected by the isoclinal line
C.The isopors
D.The magnetic poles
A.purple
B.orange
C.blue
D.yellow
A.the primary great circle of the Earth perpendicular to the axis
B.the line to which all celestial observations are reduced
C.the line from which a celestial body's altitude is measured
D.All of the above
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What describes a flood current（）.
（） 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 navigating a vessel，you（）.
You have been informed that dredging operations may be underway in your vicinity.Which buoy indicates the dredging area（）.
The recording fathometer produces a graphic record of the（）.
Restricted areas at locks and dams are indicated by（）.
When using horizontal sextant angles of three objects to fix your position，an indeterminate position will result in which situation（）.
When approaching a preferred-channel buoy，the best channel is NOT indicated by the（）.
When entering a channel from seaward，the numbers on buoys（）.