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Navigation Flashcards

1
Q

What is a map?

A

A map is a scaled indicator of a portion of earth’s surface

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2
Q

What type of map is a military maps usually?

A

Military maps are usually topographic maps

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3
Q

What is found on a military map?

A
  • They show man made and natural features

- Contour lines

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4
Q

What are the 6 features which appear in the marginal information on a map?

A
  • Title information
  • Production Information
  • Universal Grid Reference
  • North Point Diagram
  • Scale and Contour
  • Legend
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5
Q

What are eastings?

A

Eastings are the vertical lines on the map

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6
Q

What are northings?

A

Northings are the horizontal lines on the map

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7
Q

What order is a grid reference given in?

A

The eastings is always given before the northings

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8
Q

What do contours close together indicate?

A

They indicate steep slopes

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9
Q

What do contours far apart indicate?

A

They indicate gentle slopes

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10
Q

When the spacing of contours is decreasing the slope is …

A

Convex (going up)

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11
Q

When the spacing of contours is increasing the slope is …

A

Concave (going down)

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12
Q

How does the Mil System work?

A

The mil system divides the circle into 6400 mils

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13
Q

What points are North, East, South and West respectively on a MILS compass?

A

North - 6400
East - 1600
South - 3200
West - 4800

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14
Q

Why is the mil system preferred in the army?

A

It is convenient as 1 mil subtends approximately 1m at 1000m

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15
Q

What are the three types of north?

A

True North, Grid North and Magnetic North

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16
Q

What is true north?

A

It is the direction of the geographic North Pole

17
Q

What is grid north?

A

It is the direction in which the eastings point towards the top of the map

18
Q

What is magnetic north?

A

It is the direction in which a compass needle points when affected only by the earth’s magnetic field

19
Q

How to convert from grid to magnetic bearing?

A

Subtract 200 mils

GMS - Grand Ma Sucks

20
Q

How to convert from magnetic to grid bearings?

A

Add 200 mils

MGA - My Great Apples

21
Q

What are the features of a map? BOLTS

A 
Border
Orientation
Legend
Title
Scale
22
Q

What are some example of other types of maps?

A
  • civilian map
  • hydrographical map
  • aeronautic charts
23
Q

What is a knoll and how is it represented?

A
  • A hill top

- Shown by a loop contour or several concentric loop contours

24
Q

What is a spur and how is it represented?

A
  • A lateral ridge or tongue of land descending from a hill

- Shown by a u or v created by contour lines pointing away from the high point

25
Q

What is a ridge and how is it represented?

A
  • A chain of mountains or hills

- Shown by two contour lines side by side at the same elevation for some distance

26
Q

What is a saddle and how is it represented?

A
  • The lowest point between two peaks or two knolls

- Shown by contour lines that typically look like an hour glass

27
Q

What is a valley and how is it represented?

A
  • A valley is a low ground between higher areas

- The v or u shape of contour lines point towards higher ground

28
Q

How do you to take a back bearing?

A
  • If the bearing is greater than 3200mils, subtract 3200

- If the bearing is less than 3200 mils, add 3200mils

29
Q

What are the 6 steps to a resection?

A
  1. Select 3 prominent, widely spread features that can be recognised on map and ground
  2. Take a magnetic bearing to these feature with a compass
  3. Convert these magnetic bearings to grid bearings
  4. Convert magnetic bearings to back bearings
  5. Using your compass plot the back bearings from the features
  6. These lines will either intersect to locate your position or form a small triangle of error
30
Q

How fast does an average cadet walk on flat terrain?

A

5km/h

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