問題一覧
1
What coordinates reference systems does GPS use?
WGS 84
2
In the hyperbolic system, a set of hyperbole generated by the Master and One Slave sre referred to as a___________
pattern
3
A satellite system comprising constellations of satellites orbiting over the Earth's surface and continuously transmitting signals rhat enable users to determine their position.
GNSS
4
What should you apply to ECHO SOUNDER reading to the determine depth of water?
Add the draft of the vessel
5
The horizontal angle between the direction of an object and another object, or between it and that of true north.
bearing
6
Magnetic compass will have the greatest directive for at the_____
magnetic equator
7
The Variation of the area is 4º 15' west (1985). Annual decrease: 8'. The current year is 2021; what is variation at this location?
0° 33'E
8
Magnetic bearing of a lighthouse is 072 deg, variation in the area according to the chart is 3 deg E. What is its True bearing?
075 deg T
9
Where do Compass needle derives its directive force?
Earth's Magnetic Field
10
During an accident, when you are going to stop vouage data recorder?
after the event
11
True bearing of a lighthouse is 030 deg T, variation in the area according to the chart is 6 deg W. What is its Magnetic bearing?
036 deg M/B
12
Which publications should you consult if you need further information on GPS Derived Positions?
Annual Notice to Mariners
13
Where can you usually find Permanent magnetism?
hard iron
14
An echo sounder is navigational tool to prevent________
grounding
15
Compass heading in a liquid compass is indicated by:
lubbers line
16
It is used to select range of an echo sounder
Range switch
17
When entering shallow waters, it is prudent to switch on the_______
ECHO SOUNDER
18
Bearing measured clockwise from geographic north
true bearing
19
An ECHO SOUNDER component whose function is to amplify the week electrical oscillation produced in the transduce
receiver
20
The primary purpose of ECDIS on board ship.
contribute to safe navigation
21
Fluid inside the compass is a mixture of :
Distilled water/pure ethyl alcohol
22
Where are ECHO SOUNDER transducers usually mounted
away from the propellers
23
Variation is a compass error that you____
cannot correct mechanically
24
It is used to select the unit of measurement of an echo sounder.
Unit selector switch
25
Its full capacity and global coverage was achieve d by 2015 with 23 of 27 satellites operational. The accuracies are comparable to hut a litte lower than GPS. The frequencies are the same L1 and L2 but originally adopted a different access mode, FDMA before shifting to CDMA.
GLONASS
26
the principal difference between eLoran and traditional Loran-C is the addition of a _______on the transmitted signal
data channel
27
Loran-C receiver in operation first receives pulses from the_______
master station
28
Includes electronic navigatioal charts (ENC) and integrates position information from the global positioning system (GPS) and other navigational sencors, such as radar, fathometer and automatic identification systems (AIS)
ECDIS
29
It is used to select the unit of measurement of an echo sounder.
unit selector switch
30
The type of transmission used in Loran-C is________
Single pulse