A.parallel bearings
B.long-range bearings
C.short-range bearings
D.cross bearings
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A.their transmitters
B.their receivers
C.their radars
D.their lorans
A.if
B.how
C.when
D.where
A.radar
B.omega
C.satellite navigator
D.DF
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
最新試題
While you are at anchor，what will serve as a positive warning that you are drifting towards the wrecks located to the NW and SW of your 2215 position（）.
With respect to automatic identification systems（AIS），which information is expected to be broadcast every 1 to 10 seconds（）.
The information received by AIS will be displayed on（）.
If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the（）.
Which of the following statements is TRUE regarding automatic identification systems（AIS）（）.
Would you mind（）your DF?
Which of the following statements is TRUE regarding crane operations（）.
（）is not a factor which will affect the accuracy of GPS receiver.
（）is a digitized“picture”of a chart.
The heading of a vessel is indicated by what part of the compass? （）