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Nav 1 Review

Total questions: 40

Worksheet time: 27mins

Name
Class
Date
1.

A device used to measure depth of water, using short pulse sound energy transmitted vertically down

a)

GPS

b)

AIS

c)

RADAR

d)

ECHO SOUNDER

2.

The ______ taken for sound waves to echo back is used to determine depth.

a)

distance

b)

speed

c)

time

d)

specific density

3.

The following are components of an Echo Sounder EXCEPT?

a)

Transducer

b)

Pulse Generator

c)

Recorder

d)

Transponder

4.

Placement of transducer must be away from ________.

a)

noises and vibrations

b)

the seawater

c)

rust and other chemicals

d)

acids and extreme heat

5.

Switch to select the unit feet, fathoms or meter as required.

a)

Unit selector switch

b)

Range Switch

c)

Gain Switch

d)

Paper speed Control

6.

Used to adjust such that the clearest echo line is recorded on the paper.

a)

Range switch

b)

Gain switch

c)

unit selector switch

d)

paper speed control

7.

This switch can be used to feed the ship’s draught such that the echo sounder will display the total sea depth. This switch is also used to adjust the start of the transmission of the sound pulse to be in line with the zero of the scale in use.

a)

Zero Adjustment or Draught setting control

b)

Fix or event marker

c)

Transducer changeover switch

d)

Dimmer

8.

This button is used to draw a line on the paper as a mark to indicate certain time e.g. passing a navigational mark, when a position is plotted on the chart etc.

a)

Fix or event marker

b)

Transducer changeover switch

c)

Dimmer

d)

Draught setting control

9.

The two techniques or principle used in the working of an Echo Sounder:

a)

phasing, ranging

b)

sounds, vibration

c)

depth, length

d)

pulsing. flashing

10.

In Phasing the speed of the stylus motor:

a)

remains constant

b)

remains intermittent

c)

varies

d)

fluctuates

11.

When using phasing technique, we must always start sounding at lowest range and check for echoes.

a)

True

b)

False

c)

Undecided

d)

Bahala na si Batman

12.

The echo may be reflected no. of times from the bottom of the sea bed, hence providing the multiple depth marks on paper.

a)

Multiple echoes

b)

The thermal and density layers

c)

Zero line adjustment error

d)

Cross noise

13.

Aeration can be due to:

a)

pockets of bubble due to heavy weather

b)

slight alteration of course

c)

Rolling

d)

swimming dolphins near the ship

14.
Which geographic tool is a 3D model of the Earth?
a)
aerial photo
b)
map
c)
diagram
d)
globe
15.

How are the vertical and horizontal lines called in a map?

a)

Latitude and Longitude

b)

Longitude and Latitude

c)

Equator and Greenwich

d)

UK and USA

16.
What is the name of the line at zero degrees longitude?
a)
Equator
b)
Prime Meridian
c)
North Pole
d)
South Pole
17.
How many times does one satellite orbit the Earth in a day?
a)
One time
b)
Three times
c)
Two times
d)
Four times
18.
The GPS satellites emit navigation signals
a)
Only when needed
b)
Only when orbiting the USA
c)
24 hours a day
d)
When you turn on a GPS system
19.
Is this showing latitude or longitude?
a)
Latitude
b)
Longitude
20.

The Automatic Identification System (AIS) has been developed for the following purpose EXCEPT:

a)

support safety at sea

b)

support efficient navigation

c)

protection of marine environment

d)

protection of shore personnel

21.

Which of the following type of ship is required by SOLAS Convention to carry AIS on board?

a)

passenger ships

b)

cargo ship less than 300 grt engaged in international voyage,

c)

fishing vessel

d)

cargo ships of less than 500 grt engaged in coastal navigation

22.

It is important to understand the description and operation of AIS because:

a)

it promotes safe and efficient navigation

b)

it hinders protection of the marine environment

c)

it is not essential safety and rescue

d)

it undermines the need for safety equipment and appliances

23.

Australia is in what Hemisphere?

a)

Northern

b)

Southern

c)

Eastern

d)

Western

24.
Lines of Latitude can be measured up to what degree?
a)
150 degrees
b)
180 degrees
c)
90 degrees
d)
100 degrees
25.
The invisible line at 0 degrees latitude is called the ________. 
a)
International Date Line
b)
Prime Meridian
c)
Equator
d)
Arctic Circle
26.

The ______ taken for sound waves to echo back is used to determine depth.

a)

distance

b)

speed

c)

time

d)

specific density

27.
How does a GPS receiver tell how far away a satellite is from it
a)
the time difference between them
b)
it always flies the same height
c)
that is not necessary
d)
all three answers
28.
If a signal bounces off a receiver, this can cause
a)
Signal interference
b)
Signal refraction
c)
Signal reflection
d)
Signal crossing
29.
The U.S. _________ has been using GPS to help guide ships.
a)
military
b)
runners
c)
team
30.
GPS is a system that tells you exactly where you are.  Is this true or false?
a)
True
b)
False
31.
Lines of Latitude can be measured up to what degree?
a)
150 degrees
b)
180 degrees
c)
90 degrees
d)
100 degrees
32.
Lines of Longitude run from the _____ to the ______.
a)
East, West
b)
North, South
c)
South, East
d)
North, West
33.
The invisible line at 0 degrees latitude is called the ________. 
a)
International Date Line
b)
Prime Meridian
c)
Equator
d)
Arctic Circle
34.
The invisible line at 0 degrees longitude is called the _________.
a)
International Date Line
b)
Prime Meridian
c)
Equator
d)
Antarctic Circle
35.
Lines of longitude are also called  ____________.
a)
Hemispheres
b)
Meridians
c)
parallels
d)
International Date Lines
36.
What does GPS stand for?
a)
Global Positioning System
b)
Global Positioning Satellites
c)
Global Positioning Software
d)
Global Phone System
37.
How do satellites synchronize communications
a)
atomic clocks
b)
they don't 
c)
GPS station
d)
with their software
38.

What is this symbol?

a)

scale

b)

key

c)

compass rose

d)

map

39.
The needle of a compass always points _________________________.
a)
at the equator
b)
North
c)
South
d)
What's a compass?
40.
Poles are ....
a)
The part of the magnet where the force is the strongest
b)
A force created by magnets that pulls some metals
c)
To Pull towards
d)
An object able to pull some metals towards itself

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