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
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.
To obtain accuracy in fixing by DF，（）and three stations should be used.
（）is not an alarm required by IMO standards to be available on the ECDIS.
（）is not a factor which will affect the accuracy of GPS receiver.
Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
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 line connecting the Loran-C master station with a secondary station is called the（）.
If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the（）.
Which statement concerning GPS is TRUE（）.
（）is not a component of GPS.