chart

Charts and their uses

21.

The changes in the channel's sands and buoys on this coast are ______ this chart can not be considered as a safe guide of the channel． A．frequent B．so frequent C．frequent that D．so frequent that 22.

The chart of a beach area shows a very flat slope to the underwater beach bottom．What type of breakers can be expected when trying to land a boat on this beach ________． A．Surging B．Spilling C．Plunging D．Converging 23

The only cylindrical chart projection widely used for navigation is the ______． A．Lambert conformal B．Mercator C．Azimuthal D．Gnomonic 24.

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 25.

The shoreline on charts generally represents the mean ______． A．High water line B．Low water line

C．Low water spring line D．Tide level

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Charts and their uses

26.

The short-long dashed magenta line around Gardiners Island marks ______． A．A regulated anchorage B．Fish trap areas

C．An area closed to the public D．Underwater cables 27.

The short-long dashed，magenta lines parallel to York River Entrance Channel mark ______．

A．fish trap areas

B．naval exercise areas C．underwater cables

D．recommended track lines 28.

The soundings on the imperial chart are measured in ______． A．Feet B．Yards C．Fathoms D．Meters 29.

The survey information upon which a chart is based is found ______． A．At the top center of the next line B．Near the chart title C．At the lower left corner D．At any convenient location 30.

What information is found in the chart title ________． A．Date of the first edition

B．Date of the edition and，if applicable，the revision C．Information on the sounding datum

D．Information on which IALA buoyage system applies 31.

What information is NOT found in the chart title ________． A．Survey information

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Charts and their uses

B．Scale

C．Date of first edition D．Projection 32.

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 33.

When a buoy is in position only during a certain period of the year，where may the dates when the buoy is in position be found ________． A．Light List

B．Notice to Mariners C．On the chart D．Coast Pilot 34.

Where would you obtain data on currents for areas of the world not covered by the National Ocean Service ________． A．In the Coast Pilot

B．In the Nautical Almanac C．In the List of Lights D．In the Sailing Directions 35.

Which aid is NOT marked on a chart with a magenta circle ________． A．Aero light B．Radar station

C．Radar transponder beacon D．Radiobeacon 36.

Which chart symbol indicates the bottom is clay ________． A．Cly B．Cla C．Cl

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Charts and their uses

D．C

37.

Which information does the outer ring of a compass rose on a nautical chart provide ________． A．variation

B．true directions

C．magnetic directions

D．annual rate of variation change 38.

Which information is found in the chart title ________． A．Number of the chart B．Edition date

C．Variation information D．Survey information

39.

Which statement about a gnomonic chart is correct ________． A．A rhumb line appears as a straight line

B．Distance is measured at the midlatitude of the track line

C．Meridians appear as curved lines converging toward the nearer pole D．Parallels，except the equator，appear as curved lines

D C D C C B C A A C A D C D C A B A A C D B B B A B A A B C C A A D A C B D D

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