true directions
compass error
deviation
magnetic directions
第1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2题：
The numeral in the center of a wind rose circle on a pilot chart indicates the ______.
A.total number of observations
B.average wind force on the Beaufort scale
C.average wind force in knots
D.percentage of calms
第3题：
The chart shows that from 2005 to 2008，．
A．the percentage of the Spanish families with a computer rose 35 points
B．the percentage of the White families with a computer remained unchanged
C．the number of the Black families with a computer was on the decrease
D．the number of the Asian families with a computer showed the sharpest increase
第4题：
______ is a digitized“picture”of a chart．
A.Vector chart format
B.Raster chart data
C.pixel
D.Electronic Nautical Chart
第5题：
On a nautical chart，the inner ring of a compass rose indicates ______.
A.true directions
B.compass error
C.deviation
D.magnetic directions
第6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
第7题：
Information for updating nautical charts is primarily found in the ______.
A.Notice to Mariners
B.Coast Pilots
C.nautical chart catalogs
D.Sailing Directions
第8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9题：
The most accurate method of determining gyrocompass error while underway is by ______．
A.Comparing the gyro azimuth of a celestial body with the computed azimuth of the body
B.Comparing the gyro heading with the magnetic compass heading
C.Determining from the chart the course made good between celestial fixes
D.It cannot be determined accurately at sea due to drift of unknown currents
第10题：
How is variation indicated on a small-scale nautical chart?______.
A.Magnetic compass table
B.Magnetic meridians
C.Isogonic lines
D.Variation is not indicated on small-scale nautical charts