On a chart，the characteristic of the light on a lighthouse is shown as flashing white with a red sector．The red sector ______．

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• 1Mean high water is the average height of ______．

  A.the higher high waters

  B.the lower high waters

  C.the lower of the two daily tides

  D.all high waters

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• 2A line connecting all possible positions of your vessel at any given time is a ______．

  A.longitude line

  B.isogonic lines

  C.latitude line

  D.line of position

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• 3Admiralty Notices to Mariners，containing important information for the mariners and enabling them to keep their charts and books corrected for the latest information，are issued daily and published in ______．

  A.Weekly Editions

  B.Quarterly Editions

  C.Annual Editions

  D.Monthly Editions

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• 4Bearings are true reckoned ______ in Admiralty Charts．

  A.clockwise from 000 to 359 degrees

  B.clockwise from 359 to 000 degrees

  C.anti-clockwise from 000 to 359 degrees

  D.anti-clockwise from 359 to 000 degrees

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• 5Wind direction may be determined by observing all of the following EXCEPT ______．

  A.low clouds

  B.waves

  C.whitecaps

  D.swells

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• 6Attention is ______ the advice on the use of charts in The Mariner's Handbook Chapter 3，Section 1．

  A.fixed to

  B.needed for

  C.pushed to

  D.drawn to

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• 7Navigational charts are subject to frequent changes，the important ones of which are promulgated by ______．

  A.Admiralty Notices to Mariners

  B.Mariner's Handbook

  C.Catalogue

  D.Sailing Directions

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• 8Which statement is true of the Uniform Lateral System of Buoyage？

  A.It employs top marks

  B.Lighted buoys have the same shape as unlighted buoys

  C.The numbering or lettering of fairway buoys is optional

  D.All of the above

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• 9Chart legends which indicate a conspicuous landmark are printed in ______．

  A.capital letters

  B.italics

  C.boldface print

  D.underlined letters

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• 10A weather forecast states that the wind will commence backing．In the Northern Hemisphere(北半球), this would indicate that it will ______．

  A.shift in a clockwise manner

  B.decrease in velocity

  C.continue blowing from the same direction

  D.shift in a counterclockwise manner

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