chart

Charts and their uses

Charts and their uses

1.

______ is not a position-fixing system． A．Hifix B．Hyperfix C．Trisponder D．WGS84 2.

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 3.

A polyconic projection is based on a ______． A．Plane tangent at one point

B．Cylinder tangent at one parallel C．Cone tangent at one parallel

D．Series of cones tangent at selected parallels 4.

A revised print of a chart is made ______．

A．after every major hydrographic survey of the area covered by the chart

B．when there are numerous corrections to be made or the corrections are extensive C．when a low-stock situation occurs and minor corrections are made D．every two years to update the magnetic variation information 5.

Areas enclosed by a long and short dashed magenta line indicate ______． A．Cable areas

B．Dumping grounds C．Fish trap areas

D．Precautionary areas

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Charts and their uses

6.

Chart legends printed in capital letters show that the associated landmark is ______． A．inconspicuous B．conspicuous

C．a government facility or station D．a radio transmitter 7.

Charts should be corrected by using information published in the ______． A．Light List

B．American Practical Navigator C．Notice to Mariners D．Coast Pilot 8.

Charts showing the coast of Mexico are produced by the United States ______． A．National Geospatial-Intelligence Agency B．Coast Guard

C．Naval Observatory D．National Ocean Service 9.

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 10.

Every chart is liable to be incomplete ______．

A．the final judge of the reliance the mariner can place on the information given B．its immediate importance cannot always be verified before promulgation C．through imperfections in the survey on which it is based，or subsequent alterations to the topography or sea floor

D．deferring the promulgation of certain less important information 11.

For what purpose would using a Lambert conformal chart be more convenient than using a Mercator ________．

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Charts and their uses

A．Plotting radio bearings over a long distance B．Determining latitude and longitude of a fix C．Measuring rhumb line distances D．Measuring rhumb line directions 12.

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 13.

Many of the soundings shown on the chart are derived from ______．Undue reliance should not be placed upon them．

A．Complete and often very poor surveys B．Correct and often very good surveys C．Inadequate and often very old surveys D．Adequate and present surveys 14.

Navigational charts are ______ frequent changes，the important one of which are promulgated by Admiralty Notices to Mariners． A．Published with B．Combined with C．In connection with D．Subject to 15.

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 16.

On chart，bearings to near objects should be used in preference to objects farther off，because ______．

A．a small error in bearing or in laying it down on the chart has a greater effect in

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Charts and their uses

misplacing the position the longer the line to be drawn

B．all scales are kept updated for vital information by Notices to Mariners

C．the larger the scale of the chart，the greater the detail that can be shown on it D．the mariner using the medium scale charts for passage along a coast need not transfer on to a large scale for short distances 17.

Particular care is needed when navigating in the vicinity of ______ as very few of these features have been fully surveyed to modern standards to determine their correct position，full extent，or the least depth over them． A．SW of Cocos Islands

B．oceanic dangers or seamounts C．undiscovered dangers D．the continental shelf 18.

That the scale of any part of a chart to be larger than the scale of the survey is ______． A．very rare B．common C．often

D．reasonable 19.

The arrangement of charts in the catalogue is ______． A．on a regional basis B．on a national basis C．shown orderly

D．appeared from A to W 20.

The broken magenta lines（long and short dashes）in and around Mobjack Bay indicate ______．

A．Amphibious training areas B．Grounds for dredge spoil C．Fish trap areas

D．Gunnery exercise areas

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