A.Rhythm
B.Period
C.Intensity
D.Color
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A.Magnetic compass table
B.Magnetic meridians
C.Isogonic lines
D.Variation is not indicated on small-scale nautical charts
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
最新試題
To obtain accuracy in fixing by DF，（）and three stations should be used.
Which of the following statements is TRUE regarding automatic identification systems（AIS）（）.
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（）.
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.
（）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.
Loran-C uses the multiple pulse system because（）.
（）is not an alarm required by IMO standards to be available on the ECDIS.
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
Which statement concerning GPS is TRUE（）.