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Geographical Skills

OS maps: scale, grid references, distance and direction

  • 3 things to know
  • All three papers

Overview

What the 1:50 000 and 1:25 000 scales mean, grid squares, four-figure and six-figure grid references, measuring straight and winding distances, and the eight compass points.

What you need to know

Answer each one before you reveal it.

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Key term

On a 1:50 000 map, what distance on the ground does 1 cm represent?

Key term

On a 1:25 000 map, what distance on the ground do 4 cm represent?

Key term

Which shows more detail, a 1:25 000 map or a 1:50 000 map, and why?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    On a 1:50 000 map, what distance on the ground does 1 cm represent?

    Model answer

    500 m, because 50 000 cm is half a kilometre.

  2. 2

    On a 1:25 000 map, what distance on the ground do 4 cm represent?

    Model answer

    1 km, because each centimetre stands for 250 m.

  3. 3

    Which shows more detail, a 1:25 000 map or a 1:50 000 map, and why?

    Model answer

    The 1:25 000 map, because everything is drawn twice as large, so small features such as field boundaries can be included.

  4. 4

    How big is one grid square on the ground, and how wide is it drawn at each of the two common scales?

    Model answer

    One kilometre square on the ground either way, drawn 2 cm across at 1:50 000 and 4 cm across at 1:25 000.

  5. 5

    What does a four-figure grid reference identify?

    Model answer

    One whole grid square, a square kilometre of ground.

  6. 6

    Which half of a grid reference is read first?

    Model answer

    The eastings, read along the bottom of the map, before the northings read up the side.

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500 m, because 50 000 cm is half a .
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