單項選擇題Which statement about satellite navigation is TRUE? （）

A.While a fix can be generated by signals received from two satellites，three satellites are necessary for reliable accuracy
B.The satellites are in equatorial orbits around the earth about 60°of longitude apart
C.The satellite navigation system determines a fix by measuring the doppler shift of the radio signals from the satellite
D.The ship's receiver cannot begin processing data until the antenna locks onto the satellite and starts continuous tracking


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1.單項選擇題Which statement concerning GPS is TRUE（）.

A.It cannot be used in all parts of the world
B.There are 12 functioning GPS satellites at present
C.It may be suspended without warning
D.Two position lines are used to give a 2D fix

2.單項選擇題（）is not an alarm required by IMO standards to be available on the ECDIS.

A.Deviating from a planned route
B.Approach to waypoints and other critical points
C.Light house detecting
D.Larger scale chart available

3.單項選擇題Would you please（）on the radar?

A.Switch
B.To switch
C.Switched
D.Will switch

4.單項選擇題Which of the following statements is TRUE regarding automatic identification systems（AIS）（）.

A.AIS is a global tracking system that relies upon INMARSAT C service to communicate vessel position and other safety related information to similarly equipped vessels，aircraft and shore stations within the area
B.AIS is a short-range 3 cm X-band radar system that automatically sends a vessel's position and other safety related information to similarly equipped vessels，aircraft and shore stations within the area
C.AIS is a short-range VHF-FM system that automatically broadcasts a vessel's position and other safety related information frequently to similarly equipped vessels，aircraft and shore stations within the area
D.AIS is a one-way centrally managed system that requires the local VTS to send commands to instruct each vessel to broadcast position and other safety related information to similarly equipped vessels，aircraft and shore stations within the area

6.單項選擇題The heading of a vessel is indicated by what part of the compass? （）

A.Card
B.Needle
C.Lubber's line
D.Gimbals

8.單項選擇題What does not contribute to the commercial GPS receiver position error（）.

A.Satellite clock
B.Ship's speed
C.Atmospheric/ionospheric propagation
D.Receiver

9.單項選擇題Radar makes the most accurate determination of the（）.

A.direction of a target
B.distance to a target
C.size of a target
D.shape of a target

10.單項選擇題The line connecting the Loran-C master station with a secondary station is called the（）.

A.Focus line
B.Base line
C.Side line
D.Center line