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

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• 1The 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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• 2______ 20 targets can be tracked at one time．When maximum tracking capacity is reached，no further acquisitions(捕获) are possible．

  A.As many as

  B.So many as

  C.As much as

  D.As more as

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• 3You have another ship overtaking you close aboard to starboard．You have 3 radar targets bearing 090° relative at ranges of 0.5 mile，1 mile，and 1.5 miles．In this case，the unwanted echoes are called ______．

  A.multiple echoes

  B.spoking

  C.indirect echoes

  D.side-lobe echoes

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• 4In order to insure that the racon signal is visible on your 3 cm radar，the ______．

  A.10 cm radar should be placed on standby or turned off

  B.gain control should be turned to maximum

  C.radar should be stabilized，head up

  D.rain clutter control should be off but，if necessary，may be on low

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• 5A vessel's position should be plotted using bearings of ______．

  A.fixed objects on shore

  B.buoys at a distance

  C.buoys close by

  D.All of the above

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• 6A 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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• 7Magnetic heading differs from compass heading by_______．

  A.compass error

  B.true heading

  C.variation

  D.deviation

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• 8Deviation 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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• 9Your 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？______．

  A.The danger signal； five or more short and rapid blasts on the whistle

  B.Three blasts on the whistle； one short，one prolonged and one short

  C.Three blasts on the whistle； one prolonged followed by two short

  D.No special signal other than the normal fog signal

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• 10A 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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