Nav 2

Question 1

Why is no chart of earth completely accurate

Answer 1

• A sphere is a undevelopable surface (paper is two-dimensional and the earth is 3-D)
• Problem is developing a method for transferring the meridians and parallels to a developable surface that will preserve certain desired characteristics

Question 2

Desirable chart characteristics

Answer 2

• Constant scale

- Course lines are great circles

Question 3

Describe a great circle

Answer 3

A great circle is a circle formed by continuing the arc inscribed by connecting the shortest distance between two points on a sphere
OR
A circle whose plane passes through the earth’s center, dividing it into two equal halves

Question 4

Describe a great circle route

Answer 4

• Shortest distance between two points
• Every meridian is a great circle
• The equator is the only parallel that is a great circle

Question 5

Describe Lambert Conformal Charts

Answer 5

The most widely used projection.

A “conic” projection

Question 6

Characteristics of a Lambert

Answer 6

• Parallels are equally spaced concentric circles
• Meridians are straight lines converging at the poles
• Scale is a constant distance scale
• Great circle routes plot as straight lines

Question 7

List types of Lambert Conformal Charts

Answer 7

• Operational Navigation Chart (ONC)

- Tactical Pilotage Chart (TPC)

Question 8

Describe the Operational Navigation Chart

Answer 8

• Provides a worldwide coverage at a scale of 1:1,000,000
• Contains multicolor hydrographic and cultural features
• Used for planning long-range navigation

Question 9

Describe the Tactical Pilotage Chart

Answer 9

• Provides worldwide coverage at 1:500,000
• Has greater detail for visual and low-level radar nav
• Most common chart for route planning

Question 10

Why is Mercator not used

Answer 10

Variable distance scales

Curved great circle routes

Question 11

Define Course

Answer 11

The aircraft’s intended flight path.

Any straight line between two points on a Lambert is the True Course

Question 12

Define Heading

Answer 12

the direction the nose of the aircraft is pointing. Will differ from the course to compensate for crosswind

Question 13

Define Track

Answer 13

The aircraft’s actual flight path over the ground. Shown as a dashed line

Question 14

Explain magnetic variation

Answer 14

The angular difference between true north and magnetic north from any given position on the earth’s surface. Expressed in degrees east or west

Question 15

Equations for computing true and magnetic directions using magnetic variation

Answer 15

MC = TC - East Variation

MC = TC +West Variation

Question 16

Describe the global timekeeping system

Answer 16

A common time standard that allows for coordination of assets on a global basis.

Question 17

Time zone characteristics

Answer 17

360 degrees/24hours = 15 deg/hr. Gives us 24 time zones; each with 15 deg of width

Question 18

Define local mean time

Answer 18

The time withing each zone

Question 19

What time format is used in flight plans?

Answer 19

Greenwich mean time

Question 20

Most common source for zone descriptions

Answer 20

IFR enroute supplement

Question 21

Purpose of a divider

Answer 21

measure distance

Question 22

Describe the purpose of a plotter

Answer 22

Used to aid in drawing course lines and measuring direction

Question 23

List parts of a plotter

Answer 23

• Straightedge
• Grommet
• Protractor
• Scales

Question 24

3 Vectors of the Wind Triangle

Answer 24

Air, Ground, Wind

Question 25

Air Vector

Answer 25

Direction and Speed (TH, TAS)

Question 26

Ground Vector

Answer 26

Intended flight path (True Course or Track, Ground Spd)

Question 27

Wind Vector

Answer 27

Direction and Velocity

Question 28

Primary Purpose of a jet log?

Answer 28

Fuel Planning

Question 29

Bingo Time

Answer 29

Head back