航海英语GPS、DF及LC的使用章节练习(2018.01.25)

单项选择题
The heading of a vessel is indicated by what part of the compass? （）
A.Card
B.Needle
C.Lubber's line
D.Gimbals
单项选择题
How is variation indicated on a small-scale nautical chart?（）
A.Magnetic compass table
B.Magnetic meridians
C.Isogonic lines
D.Variation is not indicated on small-scale nautical charts
单项选择题
Due to GPS roll over of the clock cycle，GPS receivers may give the wrong time and position or may lock up permanently on（）.
A.21-Aug-99
B.21-Sep-99
C.Octoer 31，1999
D.31-Dec-99
单项选择题
Magnets in the binnacles of magnetic compasses are used to reduce the effect of（）.
A.deviation
B.variation
C.local attraction
D.All of the above
单项选择题
Induced magnetism is found in（）.
A.hard iron
B.soft iron
C.vertical iron only
D.horizontal iron only
单项选择题
Loran-C is which type of system（）.
A.Reflected electron
B.Electrical radiation
C.Quarterpoint electrical navigation
D.Hyperbolic radio navigation
单项选择题
（）is not a factor which will affect the accuracy of GPS receiver.
A.detective Availability
B.local environmental conditions
C.autonomous mode versus differential correction mode versus RTCM mode
D.the averaging of recorded locations
单项选择题
Magnetic compass deviation（）.
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
单项选择题
More exact assessment of visibility when（）is used to determine the range of vessel or other objects in the vicinity.
A.radar
B.omega
C.satellite navigator
D.DF
单项选择题
Automatic identification systems（AIS）are required to（）.
A.provide safety-related information automatically to shore stations，other vessels and aircraft
B.receive safety-related information automatically from similarly equipped vessels
C.exchange safety-related information with shore-based facilities
D.All of the above