A.Deviating from a planned route
B.Approach to waypoints and other critical points
C.Light house detecting
D.Larger scale chart available
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A.detective Availability
B.local environmental conditions
C.autonomous mode versus differential correction mode versus RTCM mode
D.the averaging of recorded locations
A.Vector chart format
B.Raster chart data
C.pixel
D.Electronic Nautical Chart
A.Card
B.Needle
C.Lubber's line
D.Gimbals
A.on loran charts covering areas where sky waves are used
B.in the Radio Aids to Navigation，PUB 117
C.in the Loran-C Correction Tables
D.Sky waves cannot be matched to ground waves in LORAN-C to produce a usable reading
A.full confirmation
B.precise appreciation
C.immediate assessment
D.timely recognition
最新試題
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.
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.
To obtain accuracy in fixing by DF，（）and three stations should be used.
The line connecting the Loran-C master station with a secondary station is called the（）.
The receiver uses（）satellites to compute latitude，longitude，altitude，and velocity．
（）is not a component of GPS.
Which of the following statements is TRUE regarding crane operations（）.
The loran lines drawn on navigation charts represent（）.
Automatic identification systems（AIS）are required to（）.
Which one of the followings does not limit the effective range of radar（）.