latitude scale near the middle of the track line
longitude scale near the middle of the track line
latitude scale at the midlatitude of the chart
latitude or longitude scale at the middle of the scale
第1题：
The distance between any two meridians measured along a parallel of latitude ______.
A.increases in north latitude and decreases in south latitude
B.decreases as DLO increases
C.increases with increased latitude
D.decreases with increased latitude
第2题：
A Mercator chart is a ______.
A.cylindrical projection
B.simple conic projection
C.polyconic projection
D.rectangular projection
第3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4题：
What is the major advantage of a rhumb line track?
A.The vessel can steam on a constant heading (disregarding wind，current，etc)
B.The rhumb line is the shortest distance between the arrival and departure points
C.It is easily plotted on a gnomonic chart for comparison with a great circle course
D.It approximates a great circle on east-west courses in high latitudes
第5题：
The path that a vessel is expected to follow，represented on a chart by a line drawn from the point of departure to the point of arrival，is the ______.
A.DR plot
B.track line
C.heading
D.estimated course
第6题：
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the ______.
A.difference in longitude
B.mid-longitude
C.departure
D.meridian angle
第7题：
Distance along a track line is measured on a Mercator chart by using the ______.
A.latitude scale near the middle of the track line
B.longitude scale near the middle of the track line
C.latitude scale at the midlatitude of the chart
D.latitude or longitude scale at the middle of the scale
第8题：
A.Presentation→GSM→GSM Line Chart
B.Presentation→GSM→Data Services→GSM Line Chart
C.Presentation→CDMA→GSM Line Chart
D.Presentation→CDMA→Data Services→GSM Line Chart
第9题：
What is NOT an advantage of the rhumb line track over a great circle track?
A.Easily plotted on a Mercator chart
B.Negligible increase in distance on east-west courses near the equator
C.Does not require constant course changes
D.Plots as a straight line on Lambert conformal charts
第10题：
When navigating in high latitudes and using a chart based on a Lambert conformal projection，______.
A.a straight line drawn on the chart approximates a great circle
B.the chart should not be used outside of the standard parallels
C.the course angle is measured at the mid-longitude of the track line
D.distance cannot be measured directly from the chart