Magnetic compass table
Magnetic meridians
Isogonic lines
Variation is not indicated on small-scale nautical charts
第1题：
20 A Gantt chart is useful in determining:
A. the level of effort for a task
B when a task starts and stops
C. how tasks are related to each other
D. who is assigned to do a task
E. All of the above
第2题：
On a mercator chart, 1 nautical mile is equal to ______.
A.1 minute of longitude
B.1 degree of longitude
C.1 minute of latitude
D.1 degree of latitude
第3题：
Assignable cause or special variation is:
A . is indicated when a point falls outside the control limits.
B . is indicated when a point falls outside the specification limits.
C . is indicated when a run of seven or more points fall above the center line of a standard control chart.
D . is indicated when a run of seven or more points fall below the center line of a standard control chart.
E . A, C, and D.
第4题：
The agonic line on an isomagnetic chart indicates the ______.
A.magnetic equator
B.magnetic longitude reference line
C.points where there is no variation
D.points where there is no annual change in variation
第5题：
Entering from sea，a daymark on the port side of the channel would be indicated on a chart by a ______.
A.red triangle with the letter R
B.white triangle with the letters RG
C.green square with the letter G
D.white square with the letters GR
第6题：
● A Gantt chart is useful in determining:
A the level of effort for a task
B when a task starts and stops
C how tasks are related to each other
D who is assigned to do a task
E All of the above.
第7题：
A revised print of a chart is made ______.
A.after every major hydrographic survey of the area covered by the chart
B.when there are numerous corrections to be made or the corrections are extensive
C.when a low-stock situation occurs and minor corrections are made
D.every two years to update the magnetic variation information
第8题：
134 Assignable cause or special variation is:
A. is indicated when a point falls outside the control limits.
B. is indicated when a point falls outside the specification limits.
C. is indicated when a run of seven or more points fall above the center line of a standard control chart.
D. is indicated when a run of seven or more points fall below the center line of a standard control chart.
E. A, C, and D
第9题：
Magnetic information on a chart may be ______.
A.found in the center(s) of the compass rose(s)
B.indicated by isogonic lines
C.found in a note on the chart
D.All of the above
第10题：
The compass rose on a nautical chart indicates both variation and ______.
A.deviation
B.annual rate of variation change
C.precession
D.compass error