A.Magnetic compass table
B.Magnetic meridians
C.Isogonic lines
D.Variation is not indicated on small-scale nautical charts
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A.accurate only in the Polar regions
B.accurate electronic servomechanisms
C.hand operated
D.accurate only if the vessel is underway
A.making a structural change to the vessel
B.a short circuit near the compass
C.belt buckles
D.All of the above
A.21-Aug-99
B.21-Sep-99
C.Octoer 31，1999
D.31-Dec-99
A.Flinders bar
B.transverse magnets
C.fore-and-aft magnets
D.soft iron spheres on the sides of the compass
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
最新試題
With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.
The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.
The heading of a vessel is indicated by what part of the compass? （）
（）is not a component of GPS.
The information received by AIS will be displayed on（）.
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.
（）is not a factor which will affect the accuracy of GPS receiver.
Radar makes the most accurate determination of the（）.
What does not contribute to the commercial GPS receiver position error（）.
Which statement concerning GPS is TRUE（）.