Nav

Question 1

What is Nav

Answer 1

The art and science of safely and efficiently directing an aircraft from one place to another, and
determining the aircraft’s position at any time.

Question 2

Problem of air Nav is

Answer 2

Where are we
Where are we going
How will we get there
When will we get there

Question 3

The shape of the earth is:

Answer 3

oblate spheroid, bulged at the equator

Question 4

The shape of the earth for nav is

Answer 4

Perfect Sphere

Question 5

True poles

Answer 5

The extremities of the diameter about which the earth rotates.

Question 6

Magnetic poles

Answer 6

The extremities of the diameter indicated by a north seeking magnet.

Question 7

Great circles?

Answer 7

A line on the surface of the earth with a centre and radius the same as the earth.

Question 8

Small circles

Answer 8

A line on the surface of the earth with a centre & radius NOT the same as the earth.

Question 9

Equator

Answer 9

A great circle which is perpendicular tho the axis of rotation and equidistant from both poles.

Question 10

Meridian lines

Answer 10

Semi-great circles that join the poles.

Question 11

Parallels of Latitude

Answer 11

Small circles that are parallel to the equator.

Question 12

Rhumb lines

Answer 12

A regularly curved line that cuts all meridians at a constant angle.

Question 13

What problem when the earth is represented on a flat map

Answer 13

Distortion

Question 14

Ideal map

Answer 14

Any 4 of:/conformality, constant scale, equal area, great circles are straight lines, rhumb lines as
straight lines, adjacent maps fit together, geographic position easily located.

Question 15

Properties of conformity

Answer 15

Scale expansion/contraction from any point is independent of azimuth/direction.
Shape on the chart conforms with the area being portrayed, and Meridians and parallels cut at right angles

Question 16

12.
List four properties of a Mercator Projection.

Answer 16

Great circle is curved convex to the pole
Scale is constant only at the standard parallel
Bearings are correct
Rhumb line is straight
The equator and meridians are the only great circles which are straight lines

Question 17

List four limitations of a Mercator Projection.

Answer 17

13.
Any four of:
Can’t depict poles
Must apply conversion angles to great circle tracks Distortion of large shapes
Large distances difficult to measure.
limited to 70N - 70S
Rhumb Lines are straight lines
Great circle is curved convex to the pole

Question 18

List four properties of a Lamberts Conformal projection.

Answer 18

Great circles are straight lines
Rhumb lines are curved concave to the nearest pole
Has 2 standard parallels
Scale considered constant
Conformal, ie bearings and shapes are correct.
Maps fit E-W if the same standard parallels are used on each map.

Question 19

Why must care be taken on plotting on lambert chart

Answer 19

b
lines of longitude convergence
C.

Question 20

methods of expressing the scale of a chart.

Answer 20

Fraction (1:100 000),
Statement (inch to one mile),
Graphically

Question 21

List 2 of the four major properties of an aviation map or chart.

Answer 21

latitude/longitude grid,
elevation in feet,
mercator or lamberts projection,
centrally controlled.

Question 22

charts used for high level instrument flight are:

Answer 22

ERC(H), ONC

Question 23

The charts used for low level visual flight are:

Answer 23

ERC(L), VNC

Question 24

Which of the following has one grid of latitude and longitude

Answer 24

ERC (L)

Question 25

Which of the following has two grids, latitude/longitude and transverse mercator grid.

Answer 25

TPC

Question 26

Which of the following has two grids, latitude/longitude and transverse mercator grid. (2 Runways with a circle around it

Answer 26

Aerodrome minor