A.hard iron
B.soft iron
C.vertical iron only
D.horizontal iron only
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A.Rhythm
B.Period
C.Intensity
D.Color
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
最新試題
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 of the following statements is TRUE regarding crane operations（）.
To obtain accuracy in fixing by DF，（）and three stations should be used.
Would you please（）on the radar?
（）is not a factor which will affect the accuracy of GPS receiver.
（）is a digitized“picture”of a chart.
（）is not a component of GPS.
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（）.
In using Loran-C，skywave reception gives greater range but is（）.
With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.