Before sailing，mariners on duty shall check the headings of magnetic compass by comparison with ______．

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• 1It may be found that，in certain circumstances，Radar Beacon can cause unwanted interference particularly ______．

  A.at close range

  B.at end on situation

  C.at head on situation

  D.at crossing situation

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• 2On no account can they cut it ______ it be fouled．

  A.would

  B.shall

  C.should

  D.do

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• 3Which of the following statement is correct regarding ship handling when in the vicinity of traffic separation schemes？______．(1)A vessel shall，so far as practicable，avoid crossing traffic lanes (2)If obliged to cross traffic lanes，she shall do so as nearly as practicable at right angles to the general direction of traffic flow．

  A.(1) only

  B.(2) only

  C.Both(1) and (2)

  D.Neither (1) nor (2)

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• 4You may find the time of slack water after low water in a certain port from ______．

  A.Deadweight Scale

  B.Tide Tables

  C.Notices to Mariners

  D.Table of Azimuth

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• 5Charted depth is the ______．

  A.vertical distance from the tidal datum to the ocean bottom plus the height of the tide

  B.vertical distance from the tidal datum to the ocean bottom

  C.average height of water over a specified period of time

  D.average height of all low waters at a place

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• 6The radio waves used for radar are very short，only ______ long．

  A.a few centimeters

  B.a few fathoms

  C.a few meters

  D.a few feet

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• 7Your radar is set on a true motion display．Which of the following will NOT appear to moveacross the PPI scope、

  A.Echoes from a buoy

  B.Own ship's marker

  C.Echo from a ship on the same course at the same speed

  D.Echo from a ship on a reciprocal course at the same speed

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• 8The 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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• 9Calibration Stations give special transmissions for the calibration of ship's ______．

  A.gyro-compass

  B.marine radar

  C.DF

  D.navigational satellite

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• 10To obtain accuracy in fixing by DF，______ and three stations should be used．

  A.parallel bearings

  B.long-range bearings

  C.short-range bearings

  D.cross bearings

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