A.remains aligned with compass north
B.also turns to starboard
C.first turns to starboard then counterclockwise to port
D.turns counterclockwise to port
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A.true bearing of the transmitter
B.relative bearing of the transmitter
C.heading of the vessel
D.time of reception
A.varies depending upon the bearing used
B.is the angular difference between magnetic north and compass north
C.is published on the compass rose on most nautical charts
D.is the angular difference between geographic and magnetic meridians
A.RINGS INT
B.SWEEP INT
C.REPEATER
D.GONIOMETER
A.ZERO CLEARING
B.ANTI-CLUTTER-RAIN
C.DIMMER
D.CURSOR
A.bearing circle
B.pelorus
C.bearing bar
D.alidade
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（）is a digitized“picture”of a chart.
When your vessel is proceeding to the area of traffic density，（）is used to determine the exact ranges of other ships or objects in the vicinity.
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.
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.
The receiver uses（）satellites to compute latitude，longitude，altitude，and velocity．
（）is not a component of GPS.
（）is not a factor which will affect the accuracy of GPS receiver.
To obtain accuracy in fixing by DF，（）and three stations should be used.
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（）.
With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.