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
Which one of the followings does not limit the effective range of radar（）.
To obtain accuracy in fixing by DF，（）and three stations should be used.
Would you please（）on the radar?
（）is not an alarm required by IMO standards to be available on the ECDIS.
The line connecting the Loran-C master station with a secondary station is called the（）.
The（）transmits own ship data cyclically via two defined VHF channels and receives the same data of the other ships and objects that are equipped with AIS systems.
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（）.
In using Loran-C，skywave reception gives greater range but is（）.
The loran lines drawn on navigation charts represent（）.
You are about to go to sea and adjust the magnetic compass．To expedite the adjustment at sea，in what order should the following dockside adjustments be made（）.