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# Minnesota Wing Aircrew Training: Task O-2024 - PowerPoint PPT Presentation

Minnesota Wing Aircrew Training: Task O-2024. Navigation and Position Determination for Scanners. Navigational Terms. Navigation Terms. Course - planned or actual path of the aircraft over the ground True course Magnetic course Heading - direction the aircraft is pointing

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Minnesota Wing Aircrew Training: Task O-2024

Navigation and Position Determination for Scanners

• Course - planned or actual path of the aircraft over the ground

• True course

• Magnetic course

• Heading - direction the aircraft is pointing

• Drift - the effect of wind

• Drift correction - degrees added to or subtracted from aircraft heading

• Nautical mile (nm) - measurement used in air navigation

• Knots (kts) - nautical miles per hour

### Longitude and Latitude

• Where they cross defines a point on the earth

• By convention, latitude is stated first

• Latitude is Based on Earth’s motion

• Axis of rotation defines poles and Equator

• Arbitrary point of Greenwich, England was chosen for ‘prime meridian’.

North Latitudes

Equator

• Parallels

• Measure How Far North or South of Equator

• Zero Degrees is Equator

• “90 Degrees North” is the North Pole

• “90 Degrees South” is the South Pole

South Latitudes

Prime Meridian

East Longitude

Longitude

• Half Great Circles Intersecting at the Poles

• Measure How Far East or West of England

• Zero Degrees is Prime Meridian (England)

• Numbers between 0 and 180 are either East or West Longitude

• 180 Degrees is opposite side of globe from England

• near international date line in Pacific Ocean

Northern Minneapolis is at 45 Degrees North (half way between the Equator and North Pole!)

93 Degrees West is roughly the Eastern edge of St. Paul.

The Northwest corner of the state:

Exactly 49 Degrees North

Roughly 97 Degrees West

Where’s Minnesota?

• Degrees of Latitude are always the same distance apart, about 60 Nautical Miles

• Degrees of longitude vary in distance – near the poles the lengths are quite small.

• In Minnesota, a degree of longitude is about 40 to 44 Nautical Miles across

• A ‘Minute’: 1/60th of a Degree

• roughly a mile in size

• Minutes are usually broken down into tenths of minutes

• Alternatively, a ‘Second’ is 1/60th of a minute

• Small high circle after number denotes degrees

• Apostrophe after number denotes minutes

• Example: Minneapolis Flying Cloud Airport

44o 49.63’ N 93o 27.43’ Wread as…44 degrees 49.63 minutes North 93 degrees 27.43 minutes West

Lines of latitude and longitude on sectional chart

### Magnetic Variation

Expressing Direction: The Compass Rose

360

330

30

N

300

60

W

E

270

90

240

120

S

210

150

180

PHYSICAL POLE

MAGNETIC POLE

• The magnetic pole and physical pole are not co-located

• The difference in heading for the two poles is measured and referred to as magnetic variation

• Near the magnetic pole the difference can be substantial

Westerly Variation

Easterly Variation

+25º

+20º

-15º

+15º

-5º

+5º

-10º

-0º

+10º

Agonic Line

• For East Variation, subtract from True Course

True Course – Variation = Magnetic Course

• For West Variation, add to True Course

True Course + Variation = Magnetic Course

• Mnemonic: “East is least, West is best”

• “Least” should make you think of subtraction

• Rule is reversed if one wishes to convert a Magnetic course to a True course.

### Airspace

• Military Operating Area (MOA)

• Military may be conducting high-speed operations

• VFR aircraft are not prohibited

• Military Training Routes

• Instrument routes (IR)

• Visual routes (VR)

• Restricted Areas

• Military may be conducting air-to-ground bombing or gunnery practice

• No other aircraft are allowed

### Sectional Charts

• Sectional Aeronautical Charts

• 1 to 500,000

• Medium to slow speed aircraft

• Types of Information

• Topographical

• Aeronautical

• Legend

• Publication Schedule

• Legend changes somewhat over time

• Four Charts Needed to Cover Minnesota

• Twin Cities

• Omaha

• Green Bay

• Chicago

• Physical Geographic Features

• Areas: Water, Cities

• Landmarks: Race Tracks, Lookout Towers

• Vertical obstructions

• Aeronautical Features

• Airports

• Airspace Boundaries

### Chart Interpretation

Seaplane Base

Power Line

Airport2 paved runwaysWeather on 118.375MHzField elev. 1424Traffic Frequency 123.0 MHzFuel available

MaximumElevationFigure

Vertical Obstruction(2549 Ft. MSL, 1192 Ft. AGL)

Low LevelMilitary Training Route

Lookout Tower

Parachute Jump Area

Airportno paved runwaysfuel available

Special Use Airspace

Restricted Airspace

Military AirportWith Control Tower

Class ‘D’ Airspace

Ultralight Area

### Pilotage and Position Determination

• Uses recognizable landmarks

• Correlate with sectional charts

• Takes practice

• Familiar things look radically different from the air

• Seasons make a difference, especially winter

• Be careful using lakes – be sure of the shape and placement next to other features

• Difficult to use in sparse areas

• Difficult at night

• Tricks:

• Look for trees to find creeks, rivers, and towns

• Sectional or Map

• Work from larger to smaller

• Work from a known location to present location

• Watch the scale on maps

• Remain suspicious if all points don’t seem to line up right

• Use groups of 3 characteristics to verify position

• Maintain positional awareness from takeoff to landing

• Finger on the map method using visual landmarks

• If necessary, ask the pilot or observer to determine position using GPS and/or VOR

THE DANGER

• The biggest single problem is crew workload

• Your perception of speed varies with altitude

SPECIAL ATTENTION

• Air crew duties

• These items should be covered during the briefing.

WAKE TURBULENCE

TALL TOWERS

POWER LINES

LOW-FLYING, HEAVY AIRCRAFT

### CAP Grid System

• Overlays standard sectional maps

• Subdivides the map into distinct working areas

• Each grid is 1/4° of latitude by 1/4° of longitude (15 minutes square) and is assigned a number

• A grid is identified by a Sectional Chart name plus a number

• Example: Twin Cities Grid 444 (St. Cloud Area)

• Grids are further divided into sub-grids labeled A, B, C, and D

• Each sectional has a standard for assigning grid numbers — for areas of overlap the grid number of the most westerly chart is used

46 00’ N

94 00’ W

93 30’ W

o

o

o

o

Sectional Grid System

30’ x 30’

Aeronautical

Chart Divison

15’ x 15’

15’ x 15’

15’ x 15’

93 45’

45 45’

45 30’ N

46 00’ N

93 30’ W

94 00’ W

o

o

o

o

o

o

Sectional Grid System

159 A

• A grid can be divided into quarter grids 7 ½ Minutes square in size

• Quarter-grids are labeled A, B, C, and D

• Example: Twin Cities Grid 159A(The Northwest quarter of TC Grid 159)

• Letters are used to define sub-grids

102-15 W

102-00 W

36 15’ N

A

B

B

A

B

C

D

C

36-07.5’ N

102 11.25 W

D

C

36-00 N

102-07.5 W

102 15’ W

102-00 W

36/102 AA

• This system does not require special numbering

• Lat-long of lower right corner defines the grid

• Letters are used to define sub-grids

103-00 W

102-00 W

37-00 N

A

B

B

A

B

C

D

C

36-30 N

102-45 W

D

C

36-00 N

102-30 W

103-00 W

102-00 W

• You can use a new sectional — normally not updated unless it gets worn out

• Use a hi-lighter (not pink) to mark grid boundaries on the chart using a long ruler

• Mark grid identification in black ink for easy visibility

• You should always keep a current sectional with you even if you have a sectional which is marked with grids