loxodromic curve
curved line concave to the equator
straight line
spiral approaching the poles as a limit
第1题：
Solid green arrows on the main body of a pilot chart indicate ______.
A.prevailing wind directions
B.prevailing ocean current directions
C.probable surface current flow
D.shortest great circle routes
第2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3题：
All straight lines represent great circle tracks on a chart based on a(n) ______.
A.Mercator projection
B.polyconic projection
C.orthographic projection
D.gnomonic projection
第4题：
第5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
第6题：
The only cylindrical chart projection widely used for navigation is the ______.
A.Lambert conformal
B.Mercator
C.azimuthal
D.gnomonic
第7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8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9题：
A chart projection depicting the poles and a small area on either side of a connecting meridian, that is sometimes used for star charts, is the ______.
A.azimuthal gnomonic projection
B.Lambert conformal projection
C.transverse Mercator projection
D.polyconic projection
第10题：
You are designing a DHCP strategy to meet the business and technical requirements. What should you do？（）