問題一覧
1
How would you show your understanding of an Echo sounder's error if you encounter a velocity of propagation in water?
If temperature, salinity or pressure changes, acoustic wave length changes therefore the depth record that will be inaccurate
2
which one best describes Gulf Stream, ?
an ocean current which originates in the Gulf of Mexico and causes warm water to travel up the East Coast of the United States
3
What is the space formed between the direction of the earths magnetic field and the horizontal?
magnetic dip
4
What is a barometer?
An instrument for measuring atmospheric pressure
5
Where can you find the data relating to the direction in velocity of rotary tidal currents?
Tidal currents table
6
How would you fulfill the condition for sailing in coastal navigation?
develop a detailed passage plan to include the weather forecast, navigation strategies and coordinate watch keeping schedule and responsibilities during the passage
7
A common compass rose as found on a nautical chart shows true North and magnetic north. How many traditional Winds are listed on a modern compass rose?
Eight
8
determine the best cross bearing line of position between two known objects ashore when piloting a vessel in order to obtain an accurate fix
The best is about 90° apart
9
What is the minimum sustain surface wind speed of a cyclone in order for it to be classified as a tropical depression?
about 33 knots
10
Referring to the light list, the light has a nominal range of 14 miles and 12.8 m high. if The visibility is 6 nautical miles and your height of eye 6.0 m at what approximate distance will you sight the light?
10.0 nautical miles
11
what is the safest and most prudent procedure to follow while navigating in the vicinity of a tropical cyclone?
Take a possible steps to avoid it if possible
12
What is the difference between the true North and magnetic north?
Variation
13
What is the earths orbital speed?
16.1 nautical miles per second
14
if you are in the southern hemisphere as a general rule (Buy's Ballot Law), How would you determine the center of low pressure?
Faces the surface of the wind the center of low is towards your left
15
How many semi-diurnal tides occur in a 24 hours and 53 minute cycle?
2
16
The dry Bulb thermometer is 30°C and the wet but the temperature is 28°C what is the relative humidity?
85%
17
Which error is being reduced by the magnets in the binnacles of magnetic compasses
Deviation Error
18
what kind of weather will you expect if the barometer reading is showing low pressure in the area (below normal)?
Stormy or wet
19
On a chart cardinal marks of the compass indicates the position of a danger and the direction of the safe side. How would you determine a WEST cardinal mark?
It is painted yellow with black bands
20
What do you think will happen to the speed of sound, when the water salinity increases?
It will increase
21
which one is part of the compass where in the graduated directions are placed ?
Compass card
22
Which of the following statements regarding differential GPS is FALSE?
It reduces geometric dilution of position
23
In a paper check correction, which of the following navigational aids should NOT Mark with a magenta circle?
Aero radio Beacon
24
What would be the required movement of a rudder in a typical cargo ship?
35° port and starboard
25
What is the speed of the sun as it moves towards the star Vega?
12 miles Per second
26
A vessel is following range to keep her self within a narrow channel. The chart indicates the range to be 243° what is the course of the vessel steering so that she can identify that the vessel is "on range"?
True course 243°
27
on what frequency does Automatic identification system (AIS) transponder transmit and receive messages ?
VHF maritime band
28
What do you call a chart that is used generally for a long ocean passage
Small scale chart
29
On an echo sounder which of these used to draw a line on the paper to mark a specific time of an occurrence?
Event marker
30
what is the top mark (if any) Of the starboard hand lateral marks used in IALA region B?
Single red cone,point upward