A.true meridian and the axis of the compass card
B.true meridian and the magnetic meridian
C.magnetic meridian and the axis of the compass card
D.axis of the compass card and the degaussing meridian
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A.vessel's geographic position
B.vessel's heading
C.earth's magnetic field
D.influence of the magnetic materials of the vessel
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
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（）is a digitized“picture”of a chart.
The（）transmits own ship data cyclically via two defined VHF channels and receives the same data of the other ships and objects that are equipped with AIS systems.
Would you please（）on the radar?
（）is not a factor which will affect the accuracy of GPS receiver.
（）is not an alarm required by IMO standards to be available on the ECDIS.
In using Loran-C，skywave reception gives greater range but is（）.
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.
With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.