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NAV GEN Flashcards

1
Q

What is a great circle?

A

The shortest distance between 2 points on the earths surface.

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2
Q

How is the track changing on Great circle track

A

Constantly changing

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3
Q

What is a Rhumb line track?

A

A curved line on the earths surface that cuts all meridians at the same angle

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4
Q

Where is Rhumb line in comparison to a Great Circle track?

A

Always towars the nearer pole

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5
Q

When are Rhumb lines and Great circle tracks the same?

A

On the equator and along a meridian

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6
Q

What is the percentage difference between Rhumb lines and Great circle tracks for:

  1. 1200 nm
  2. 1800 nm
  3. 3600 nm
A
  1. 1,5%
  2. 3,5%
  3. 14,5 %
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7
Q

Below what distance are flight flown as Rhumb line tracks?

A

Below 1000 nm

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8
Q

How does GC tracks increase/decrease with easterly/westerly tracks?

A

North: Easterly-increase, westerly-decrease
South: Easterly-decrease, westerly-increase

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9
Q

How long is 1 nm in:

  1. meters
  2. Feet
  3. minutes
A
  1. 1852m
  2. 6080ft
  3. 1 min
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10
Q

How long is 1 degree in:

  1. minutes
  2. nm
A
  1. 60 minutes

2. 60nm

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11
Q

What is the distance between two meridians at:

  1. The equator
  2. The poles
A
  1. 60 nm

2. 0 nm

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12
Q

What is the formula for departure?

A

D long x cos Lat

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13
Q

Mnemonic for basic VFR navlog setup?

A

CDMVT

Compass deviation magnetic variation true

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14
Q

Mnemonic for variation/deviations effect on Magnetic/compass hdg?

A

Mag/Var east - Mag/Var least

Mag/Var west - Mag/Var best

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15
Q

How are relative bearing measured?

A

From the nose of the aircraft

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16
Q

How are magnetic bearing obtained if you dont have an RMI?

A

MH+RB=MB

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17
Q

What is an isogonal?

A

Same magnetic variation

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18
Q

Whats an Agonic line?

A

Isogonal where variation is zero

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19
Q

Describe the 1 in 60 rule. Draw an example

A

1 degree angle at 60 nm out gives a track error of 1 nm

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20
Q

Formula for track error?

A

Dist off x 60 divided by Dist to go

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21
Q

Formula for total alteration?

A

Dist off x 60 divided by Dist to go
+
Dist off x 60 divided by Dist gone

22
Q

How are Rhumb lines/ Great circle lines depicted on Mercator/Lambert charts in N/S?

A

Mercator: RL are straight lines, GC are curved
Lambert: GC are straight, RL are curved convex to the EQ

23
Q

How is TAS calculated from RAS/CAS with altitude?

A

Add 2% per 1000 ft

24
Q

Where is convergency least/max?

A

Least at equator

Max at the poles

25
Formula for convergency?
D Long x sin Lat
26
Properties of a Mercator chart?
1. Meridians are straight lines 2. Latitudes are straight lines parallell to the EQ 3. Dist between latitudes increasees as latitude increases 4. Convergency is zero 5. Scale expands away from the equator
27
Up to what latitudes are Mercator useful?
Up to 8 deg N/S
28
Does radio waves follow RL or GC tracks?
GC tracks
29
Are GC tracks (radio waves) straight or curved lines on a Mercator
They are curved
30
How are bearings from NDB:s converted and plotted on a Mercator?
1. Convert Mag bearing to the beacon to true bearing using aircarft variation 2. Apply conversion angle 3. Take reciprocal to get RL from the beacon
31
How are bearing from VOR converted and plotted on a Mercator?
1. Take reciprocal of RMI to get magnetic radial 2. Apply conversion angle 3. Convert to true bearing using station variation
32
Between what latitudes are Lambert chart useful?
8 deg to 75 deg N/S
33
How are RL and GC tracks depicted on a Lambert chart?
RL are curves concave to the equator | GC are straight lines
34
Properties of a Lambert chart?
Conical projection 2 std parallels Scale expands away from the 2 std parallels Scale is correct at the SP:s
35
How do we plot on a Lambert? NDB/VOR RMI=65 deg Var= 15E Convergence=18 deg
80 deg True + 18 convergence= 98 deg true | Plot 98 deg T + 180 deg = 278 deg True
36
From what latitudes are Polar charts used?
75 deg - 90 deg N/S
37
Properties of Polar charts?
GC=curve concave to pole, near pole its a straight line RL=curve concave to pole Convergence is constant Scale expands away from the pole
38
How many degrees are earths tilt angle?
23,5 deg
39
How many degrees does the earth spin in 24h?
360 deg
40
1 hour change in LMT, how much is that in degrees?
15 deg
41
1 degree of change in longitude, how much is that in minutes?
4 min
42
How does UTC change with longitude change East/West?
Long west - UTC best | Long east - UTC least
43
When is civil twilight?
Sun is 6 deg below the horizon
44
When and what is "Astronomical twilight"?
Sun is 18 deg below the horizon | It's the moment of darkness
45
3 deg glideslope and 5nm from the threshold. What's your height?
1500 ft | Height=Angle x 100 x range
46
Describe acceleration errors on a compass
North: ANDS South: DNAS Max on East/West headings
47
Describe turing errors on a compass
North: UNOS South: ONUS Max on North/South headings
48
Temp error correction formula? Elevation 6200 ft Altitude 11'800 ft ISA dev = +5
TEC = 4 x (5600/1000) x +5 5'600 comes from 11'800-5'600
49
What is RNP and PBN?
Required navigation performance (RNP) is a type of performance-based navigation (PBN) that allows an aircraft to fly a specific path between two 3D-defined points in space
50
What's the difference between RNAV and RNP?
Area navigation (RNAV) and RNP systems are fundamentally similar. The key difference between them is the requirement for on-board performance monitoring and alerting. A navigation specification that includes a requirement for on-board navigation performance monitoring and alerting is referred to as an RNP specification. One not having such a requirement is referred to as an RNAV specification. Therefore, if ATC Radar Monitoring is not provided, safe navigation in respect to terrain shall be self-monitored by the pilot and RNP shall be used instead of RNAV.

GENERAL NAVIGATION (2 decks)

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