What you'll learn
Geographical skills are tested throughout the AQA GCSE Geography exam, not just in one section — you need them to read maps, interpret graphs, analyse data and draw conclusions in every part of the course. For AQA GCSE Geography you need to be confident with cartographic skills (maps), graphical skills (charts and graphs), numerical and statistical skills (calculations and averages), and the skills used in fieldwork. This guide covers Ordnance Survey map skills, the main types of graph and when to use them, the statistics you need to calculate, and how to describe and interpret data. By the end you should be able to read a map confidently, choose and interpret the right graph, and carry out the calculations the exam expects.
Key terms and definitions
Ordnance Survey (OS) map — A detailed map of the UK using standard symbols, grid references and contour lines.
Grid reference — A number used to locate a place on a map; four-figure references locate a square, six-figure references locate a point.
Contour line — A line on a map joining points of equal height, showing relief.
Scale — The ratio between distance on the map and distance on the ground.
Median — The middle value of a set of ordered data.
Mean — The average, found by adding values and dividing by how many there are.
Interquartile range — The spread of the middle 50% of the data.
Anomaly — A value that does not fit the general pattern.
Core concepts
Grid references
OS maps are covered with a grid of numbered lines. A four-figure grid reference identifies a whole grid square, using the numbers along the bottom (eastings) first, then up the side (northings) — remember "along the corridor, then up the stairs". A six-figure grid reference locates a precise point within a square by imagining each square divided into tenths, giving an extra digit for the easting and the northing. Reading eastings before northings, and always giving the correct number of figures, is essential.
Distance, scale and direction
The scale of a map tells you how map distance relates to real distance — for example, 1:50,000 means 1 cm on the map is 50,000 cm (500 m) on the ground. To measure distance, use the scale bar, measuring straight-line distances with a ruler and curved routes with a piece of string or the edge of paper. Direction is given using the eight compass points (N, NE, E, and so on); you find the direction of one place from another by comparing their positions.
Relief and contour lines
The shape of the land (relief) is shown by contour lines, which join points of equal height. Contours that are close together show steep ground; contours far apart show gentle slopes. Spot heights and the pattern of contours help you identify hills, valleys and ridges. Being able to describe the relief of an area from a map is a common exam skill.
Choosing the right graph
Different data suits different graphs, and choosing correctly is a tested skill:
- Bar charts — for comparing separate categories.
- Line graphs — for showing change over time.
- Pie charts — for showing proportions of a whole.
- Scatter graphs — for showing the relationship between two variables.
- Climate graphs — combine a bar chart (rainfall) and a line graph (temperature).
You should be able to both draw and interpret each type, and to complete a partly-finished graph accurately.
Describing data and trends
When describing data, use the phrase "describe the pattern": state the overall trend (rising, falling, staying steady), quote specific figures from the data to support it, and identify any anomalies that do not fit the pattern. Using data (figures, dates, values) is what separates a strong description from a vague one.
Numerical and statistical skills
You need to be able to calculate and interpret:
- Mean — add all values and divide by the number of values.
- Median — the middle value when the data is put in order.
- Mode — the most common value.
- Range — the difference between the highest and lowest values.
- Interquartile range — the spread of the middle 50%, reducing the effect of extreme values.
- Percentages and percentage change — to compare proportions and describe increases or decreases.
Knowing when each is useful — for example, the median is less affected by anomalies than the mean — is often tested.
Fieldwork skills
Fieldwork is assessed in the exam, so you need to understand the skills used in collecting and presenting your own data. This includes choosing a suitable sampling method (random, systematic or stratified), designing data collection sheets, and deciding what data to collect and why. You should be able to explain how you would make your data collection reliable and accurate, identify the strengths and limitations of your methods, and suggest how they could be improved. Being able to justify your choices — why you chose a particular site, method or sample size — is frequently tested.
Using maps, photographs and GIS
As well as OS maps, you need to interpret other forms of geographical information. You should be able to describe features from photographs (ground, aerial and satellite images), sketch and annotate them, and pick out geographical features. Geographical Information Systems (GIS) are increasingly used to display and analyse data on digital maps, for example showing patterns of population or flood risk. Being able to describe distributions and patterns — where things are and how they are spread out — from any of these sources is an important skill that links directly to the human and physical topics in the course.
Worked examples
Example 1: Reading a grid reference
A church is in the grid square with easting 45 and northing 78. What is its four-figure grid reference? Read the easting first, then the northing: the reference is 4578.
Example 2: Calculating the mean
Rainfall over five months was 40, 55, 60, 45 and 50 mm. Calculate the mean. Mean = (40 + 55 + 60 + 45 + 50) ÷ 5 = 250 ÷ 5 = 50 mm.
Example 3: Finding the median
Find the median of this data: 12, 8, 15, 10, 20. First put it in order: 8, 10, 12, 15, 20. The middle value is 12.
Example 4: Describing a trend
A line graph shows visitor numbers rising from 200 in January to 900 in July, then falling. Describe the trend. Visitor numbers rose steadily from 200 in January to a peak of 900 in July, then declined. This shows a seasonal pattern, with the highest numbers in summer.
Common mistakes and how to avoid them
The most common map error is reading grid references the wrong way round. Always read the easting (along) first, then the northing (up). Remember "along the corridor, then up the stairs".
Students often confuse steep and gentle slopes. Close contour lines mean a steep slope; contours far apart mean gentle ground. Do not reverse this.
When choosing a graph, a frequent mistake is using a line graph for separate categories or a bar chart for continuous change over time. Match the graph to the data — line for time, bar for categories, pie for proportions.
In calculations, students often confuse the mean, median and mode. The mean is the average, the median is the middle value (data must be ordered first), and the mode is the most common. Ordering the data before finding the median is essential.
Finally, when describing data, do not just say "it goes up". Quote figures and mention any anomalies — using data is what earns the marks.
Exam technique for "Geographical Skills"
Skills are tested throughout the paper, so practise them alongside every topic rather than separately. When you see data or a map, read the question carefully to see exactly which skill is needed.
For map questions, give the correct number of figures in grid references, use the scale bar for distances, and describe relief using contour spacing. For graph questions, read values accurately from the axes and complete graphs neatly using a ruler.
For "describe" and "calculate" questions, always use the data: quote figures, identify trends and anomalies, and show your working in calculations so you earn method marks even if the final answer slips. Learning when each average is appropriate — the median for data with anomalies, for example — helps with interpretation questions.
Quick revision summary
- Grid references: read easting (along) then northing (up); four figures for a square, six for a point.
- Scale relates map distance to real distance; use the scale bar to measure distances.
- Contour lines join equal heights; close together = steep, far apart = gentle.
- Choose graphs to suit the data: bar (categories), line (change over time), pie (proportions), scatter (relationships).
- Calculate the mean, median, mode, range and interquartile range, and know when each is useful.
- When describing data, state the trend, quote figures, and identify anomalies.