Your vessel is at anchor in fog while in international waters． The fog signal of another vessel，apparently underway，has been steadily growing louder and the danger of collision appears to exist．In addition to the normal fog signal，what signal may be used to indicate the presence of your vessel？______．

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• 1Deviation is caused by ______．

  A.changes in the earth's magnetic field

  B.nearby magnetic land masses or mineral deposits

  C.magnetic influence inherent to that particular vessel

  D.the magnetic lines of force not coinciding with the lines of longitude

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• 2Magnetic heading differs from compass heading by_______．

  A.compass error

  B.true heading

  C.variation

  D.deviation

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• 3A correction for augmentation is included in the Nautical Almanac corrections for ______．

  A.the Sun

  B.the Moon

  C.Venus

  D.None of the above

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• 4Defense plans may cause the operation of electronic aids to navigation to be suspended with ______．

  A.no notice

  B.one day's notice

  C.a week's notice

  D.thirty days notice

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• 5The system will accept a harbor map which is incorrect，therefore the operator must exercise caution in harbor selection．

  A.be considered

  B.be prudent

  C.be bold enough

  D.be carelessness

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• 6A vessel trawling would display ______．

  A.a black ball

  B.a basket

  C.a double cone，point to point

  D.none of the above

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• 7Sailing vessels are stand-on over power-driven vessels except ______．

  A.in a crossing situation

  B.in a meeting situation

  C.when they are the overtaking vessel

  D.on the inland waters of the PR China

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• 8The ridge and the low are moving ______．

  A.in some direction

  B.in opposite direction

  C.to SE and NW respectively

  D.too fast in the day that marine interests are advised that freezing spray warnings are continued for Belle Isle

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• 9At noontime Tue the wind direction will be______．

  A.S

  B.NE

  C.NW

  D.SW

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• 10It is forecast for Wed that there will be ______．

  A.winds NE 20 to 30 knots

  B.winds SW 15 knots backing to SE 15 to 20

  C.winds NW 20 to 30 knots with occasional showers

  D.mod to strong S winds diminishing to light winds

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