A.vessel's geographic position
B.vessel's heading
C.earth's magnetic field
D.influence of the magnetic materials of the vessel
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A.deviation minus variation
B.variation plus compass course
C.combined variation and deviation
D.difference between true and magnetic heading
A.magnetism from the earth's magnetic field
B.misalignment of the compass
C.magnetism within the vessel
D.a dirty compass housing
A.fore-and-aft and athwartships magnets
B.dip needle and heeling magnet
C.heeling magnet and Flinders bar
D.Flinders bar and quadrantal spheres
A.Decreasing loran readings on 9960-W
B.Visual bearings of Montauk Point Lt. changing to the left
C.Increasing bearings of Southeast Point Light
D.Decreasing soundings
A.enter a traffic separation zone
B.cross a submerged pipeline
C.depart a regulated area
D.depart a restricted area
最新試題
Loran-C uses the multiple pulse system because（）.
While you are at anchor，what will serve as a positive warning that you are drifting towards the wrecks located to the NW and SW of your 2215 position（）.
Would you mind（）your DF?
Radar makes the most accurate determination of the（）.
To obtain accuracy in fixing by DF，（）and three stations should be used.
（）is not a factor which will affect the accuracy of GPS receiver.
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
The loran lines drawn on navigation charts represent（）.
（）is not an alarm required by IMO standards to be available on the ECDIS.
With respect to automatic identification systems（AIS），which information is expected to be broadcast every 1 to 10 seconds（）.