Phone navigation is convenient, but batteries die and signals fade. Knowing how to read a map is a useful, rewarding skill for walking, travelling and understanding the world around you.
Key takeaways
- The map key explains symbols and colours.
- Scale links distances on the map to real distances.
- Contour lines show the shape and steepness of the land.
- Grid references and compass bearings help you locate and navigate.
- Orient the map to the ground before you set off.
Start with the key
Maps use symbols for roads, paths, buildings, rivers, woods and other features. The key, or legend, explains what each symbol and colour means. Different maps use different conventions, so check the key every time. Blue often means water, green means vegetation, black or red lines may indicate roads or boundaries, and brown lines are usually contours.
Understand scale
The scale tells you how a distance on the map relates to the real world. A scale of 1:25,000 means one centimetre on the map equals 25,000 centimetres, or 250 metres, on the ground. A bar scale lets you measure with a ruler or the edge of a piece of paper. Larger-scale maps, such as 1:25,000, show more detail and are good for walking, while smaller-scale ones cover bigger areas.
Read contour lines
Contour lines connect points of equal height. They reveal the shape of the land:
- Lines close together mean a steep slope.
- Lines far apart mean gentle ground.
- Concentric closed loops show a hill or a depression, with height numbers showing which.
- V-shapes in the lines point uphill along streams and valleys.
The contour interval, listed on the map, tells you the height difference between lines. Practise by looking at a landscape and then finding it on the map.
Use north
Most maps have north at the top, but check the north arrow. Many outdoor maps also show magnetic variation, the difference between true north and magnetic north, which changes by location and year. A compass needle points to magnetic north.
Grid references
Grid lines let you describe positions precisely. In many systems, you read the number along the bottom first, then the number up the side, remembering "along the corridor and up the stairs." A six-figure grid reference points to a 100-metre square. Latitude and longitude provide a worldwide coordinate system, useful with GPS devices.
Orient the map
Hold the map flat and turn it so that features on the map line up with what you can see around you, such as a road or a river. If you have a compass, line the north of the map with north on the compass, after adjusting for magnetic variation. Knowing where you are on the map is the first step of navigation.
Plan a route
Choose a route by looking for paths, roads and landmarks, and measure distance using the scale. Consider height gained and lost from contours, since steep slopes slow you down. A rough guide for walking is about five kilometres an hour on flat ground, with extra time added for climbing. Identify "handrails," linear features such as rivers or fences that you can follow, and "catching features" that tell you when you have gone too far.
Take bearings
With a compass, you can take a bearing to a landmark and follow that direction. Practise in safe, familiar places before relying on it in remote areas.
Staying safe
Tell someone your route and return time, carry water, spare clothing and a charged phone, and check the weather. Consider a paper map and compass as a backup to digital tools. Take a short navigation course from a local outdoor club if you plan to travel in remote country.
Types of maps
Different maps serve different purposes. Topographic maps show the shape of the land with contour lines, and they are used for hiking and planning. Road maps focus on routes, towns and distances. Thematic maps show the distribution of one subject, such as population, rainfall or voting patterns, usually with colour shading. Nautical charts show water depths, hazards and navigation aids, and geological maps show rock types. Choosing the right kind of map for your task makes reading easier.
Latitude and longitude
Latitude lines run east to west and measure how far north or south a place is from the equator, from zero to ninety degrees. Longitude lines run from pole to pole and measure how far east or west a place is from the prime meridian, which passes through Greenwich in London, from zero to one hundred and eighty degrees. A position is given as a pair of numbers, for example 51.5 degrees north and 0.1 degrees west for central London. Phones and GPS devices often show decimal degrees, and maps may use degrees, minutes and seconds. Knowing both forms helps you move between devices and paper maps.
Why maps distort the Earth
The Earth is a sphere, so flattening it onto paper always distorts something. The popular Mercator projection, designed for navigation in 1569, preserves angles and shapes locally, so a straight line on the map is a constant compass bearing. However, it stretches areas near the poles, which is why Greenland looks as large as Africa even though Africa is about fourteen times bigger. Other projections preserve area but distort shape. Understanding that no flat map is perfect helps you interpret them critically.
Digital mapping
Modern navigation uses satellites. GPS, operated by the United States, and other systems such as Europe's Galileo, work by measuring the time signals take to arrive from several satellites to calculate a position. Geographic information systems combine layers of data on one map, from roads to flood zones. OpenStreetMap is a collaborative project where volunteers create a free, editable map of the world. Digital maps are powerful, but they depend on batteries and signal and may contain errors, so cross-checking with other sources is wise.
Orienteering skills
Orienteering, a sport of navigating with map and compass, teaches useful habits. Keep your thumb on the map at your current position and move it as you travel. Choose handrail features such as paths and streams to follow, and pick an attack point, an easy-to-find feature near your target. Measure distance by counting paces: many people take around 60 to 65 double paces for 100 metres, though it varies, so calibrate yourself on a known distance. Relocate calmly if you lose track by finding the nearest large feature.
Frequently asked questions
What does the scale 1:50,000 mean?
One unit on the map equals 50,000 of the same units on the ground, so one centimetre is 500 metres.
How do I find my position without GPS?
Match nearby features to the map, take compass bearings to two landmarks and look for where they cross.
Are digital maps as good as paper?
They are convenient but depend on batteries and signal, so carrying paper as a backup is wise.
Why does Greenland look so big on many maps?
Many maps use the Mercator projection, which stretches areas toward the poles. This keeps angles accurate for navigation but exaggerates the size of high-latitude regions. Africa is around fourteen times larger than Greenland.
How do I read a six-figure grid reference?
The first three digits give the east-west position, with the first two being the grid line to the left of the point and the third an estimate of tenths across the square. The last three do the same for the north-south position. Remember to read eastings, along the bottom, before northings, up the side.
What are the standard map symbols?
There is no single worldwide standard, so always check the key. Common conventions include blue for water, green for woodland, brown for contours and black for roads and buildings, but details vary between countries and map series.
Sources and further reading
Written by
FactNest Editorial Team
FactNest is operated by Muonix. The FactNest Editorial Team publishes general-interest explainers with AI-assisted drafting and illustrations. Contact contact@muonix.co for questions or corrections; we respond within 2 business days.
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