A.two stations，including one on the nearest coast
B.two stations，including one on the nearer coast
C.three stations，including one on the farthest coast
D.three stations，including one on the nearest coast
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A.parallel bearings
B.long-range bearings
C.short-range bearings
D.cross bearings
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
Loran-C is which type of system（）.
（）is not a factor which will affect the accuracy of GPS receiver.
The line connecting the Loran-C master station with a secondary station is called the（）.
What does not contribute to the commercial GPS receiver position error（）.
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（）.
Radar makes the most accurate determination of the（）.
（）is not a component of GPS.
The heading of a vessel is indicated by what part of the compass? （）
Would you mind（）your DF?
Which statement concerning GPS is TRUE（）.