A.1 minute of longitude
B.1 degree of longitude
C.1 minute of latitude
D.1 degree of latitude
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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
A.National Geospatial-Intelligence Agency
B.Coast Guard
C.Naval Observatory
D.National Ocean Service
A.sailing chart
B.general chart
C.coastal chart
D.harbor chart
A.Azimuthal gnomonic projection
B.Lambert conformal projection
C.Transverse Mercator projection
D.Polyconic projection
A.fix
B.estimated position
C.dead reckoning position
D.running fix
最新試題
A chart with a scale of 1:80，000 would fall into the category of a（）.
When using a Lambert conformal chart in high latitudes，angles such as bearings are measured in reference to （）.
The revision date of a chart is printed on which area of the chart? （）
The maximum difference between mean time and apparent time is （）.
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?（）
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.
The soundings on the imperial chart are measured in（）.
What is NOT an advantage of the rhumb line track over a great circle track? （）
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（）.
The broken magenta lines（long and short dashes）in and around Mobjack Bay indicate（）.