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单选题
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
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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 circleB.the chart should not be used outside of the standard parallelsC.the course angle is measured at the mid-longitude of the track lineD.distance cannot be measured directly from the chart
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A.reputation
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单选题No navigational aids are shown and chart is not kept（）for alterations in depths inside the pecked lines joining Hurst pt. to Warden pt.A
accurateB
correctC
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单选题Isogonic lines are lines on a chart indicating （）.A
points of equal variationB
points of zero variationC
the magnetic latitudeD
magnetic dip
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单选题Solid green arrows on the main body of a pilot chart indicate （）.A
prevailing wind directionsB
prevailing ocean current directionsC
probable surface current flowD
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单选题A chart position enclosed by a semi-circle is a(n) （）.A
fixB
estimated positionC
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running fix
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单选题What is NOT an advantage of the rhumb line track over a great circle track? （）A
Easily plotted on a Mercator chartB
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单选题The loran lines drawn on navigation charts represent（）.A
Ground wavesB
SkywavesC
Either ground waves or skywaves interchangeablyD
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Unmoor all lines except the headline and forward spring.B
Moor all lines except the headline and forward spring.C
Hold on all lines except the headline and forward spring.D
Let go the headline and forward spring.
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单选题How is the annual rate of change for magnetic variation shown on a pilot chart?（）A
Gray lines on the uppermost inset chartB
Red lines on the main body of the chartC
In parenthesis on the lines of equal magnetic variationD
Annual rate of change is not shown
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the primary great circle of the Earth perpendicular to the axisB
the line to which all celestial observations are reducedC
the line from which a celestial body's altitude is measuredD
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单选题Which information is found in the chart title（）.A
A rhumb line appears as a straight lineB
Distance is measured at the midlatitude of the track lineC
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单选题SINGLE UP FORWARD TO HEAD LINE AND SPRING means（）.A
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let go the head line and spring onlyC
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let go the head line and spring including all the lines
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单选题On a gnomonic chart，a great circle track between Los Angeles and Brisbane will appear as a （）.A
loxodromic curveB
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单选题What defines a great circle? （）A
A curved line drawn on a Mercator ChartB
A course line that inscribes a loxodromic curveC
The shortest distance between any two points on the earthD
The smallest circle that can be drawn on the face of a sphere
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单选题The numeral in the center of a wind rose circle on a pilot chart indicates the （）.A
total number of observationsB
average wind force on the Beaufort scaleC
average wind force in knotsD
percentage of calms
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单选题Which method of adjusting mooring lines is MOST useful for leaving a boat free to rise and fall with the tide?（）A
Crossing the spring linesB
Slacking all forward running lines while keeping all after running lines tautC
Doubling up on spring or breast linesD
Slacking bow and stern lines
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Aero lightB
Radar stationC
Radar transponder beaconD
Radiobeacon
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