A.magnetic latitudes
B.magnetic declinations
C.dip
D.isogonic lines
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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
A.equipment's
B.tools
C.apparatus
D.aids
A.with
B.in
C.by
D.to
最新試題
On a Mercator chart，1 nautical mile is equal to（）.
The maximum difference between mean time and apparent time is （）.
Which information does the outer ring of a compass rose on a nautical chart provide（）.
（）is not a position-fixing system.
The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．
That the scale of any part of a chart to be larger than the scale of the survey is（）.
The broken magenta lines（long and short dashes）in and around Mobjack Bay indicate（）.
A chart position enclosed by a square is a（n）（）.
What information is found in the chart title? （）
Every chart is liable to be incomplete（）.