You 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 ______．

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• 1In 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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• 2A 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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• 3On no account can they cut it _______ it be fouled．

  A.would

  B.shall

  C.should

  D.do

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• 4The Pilotage-quarantine anchorage， ______ between Damen Dao and Qingshan Dao，is defined by the lines ______ the given points．

  A.situated／connected

  B.situated／connecting

  C.situating／connected

  D.situating／connecting

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• 5______ chart 3994，positions read from this chart should be shifted 0．03 minutes Northward．

  A.To consider

  B.To check

  C.To examine

  D.To agree with

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• 6______ 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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• 7The 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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• 8Defense 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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• 9A 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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• 10Magnetic heading differs from compass heading by_______．

  A.compass error

  B.true heading

  C.variation

  D.deviation

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