How to read a walking route map before you set off

A route line looks reassuringly simple. The useful work is finding out what happens along it: where the path leaves the road, which side of a stream you need, and whether the last kilometre is a gentle return or another climb.

You do not need to memorise every symbol before a local walk. Start by making the route tell a clear story from the exact start to the finish. This guide is a planning introduction, not a substitute for practising navigation with a competent instructor before tackling unfamiliar or demanding ground.

First, check what sort of map you have

Open the key or legend rather than guessing from colours. A road map, a park's illustrated leaflet and a detailed topographic map can show the same place very differently. For walking, you need enough detail to understand paths, junctions and terrain, with coverage beyond the route in case your plans change.

On a printed 1:25,000 map, 1 cm represents 250 m on the ground. At 1:50,000, 1 cm represents 500 m. That makes 4 cm and 2 cm respectively equal to one kilometre. The smaller denominator usually lets the publisher show more detail, but the sheet covers less ground.

Those ruler measurements apply at the stated printed size. A resized screenshot or a photocopy enlarged to fit the page may no longer match them. On a screen, use the map's changing scale bar rather than measuring centimetres on the glass. OS's guide to map scales is a useful reference.

Try this: find the start, the finish and the furthest point from the start before zooming in. Can you still see how the whole outing fits together?

Read the path and the permission separately

A line showing a track tells you something about the landscape. It does not, by itself, establish a right to walk there. A downloaded route overlay is another layer again: check the mapping underneath it.

In England and Wales, on OS Explorer maps, public rights of way are shown in green; on OS Landranger they are magenta. Black dashed paths are not necessarily public rights of way. Use the actual map key to distinguish the symbols, and check the relevant authority or land manager for current restrictions.

• England and Wales: check the public-rights-of-way guidance, council information and any relevant access-land rules. Permissive access depends on the landowner's permission.
• Scotland: access works differently. Read the Scottish Outdoor Access Code rather than assuming the English and Welsh map symbols describe the whole position. Responsible access rights cover much land, with important exceptions.
• Northern Ireland: use the local rights-of-way guidance and the relevant council or land manager. Do not import assumptions about access from elsewhere in the UK.

For a real walk, resolve an uncertain link before relying on it to complete a circuit. A route that only works if an unverified shortcut is available needs more checking.

Let the contours explain the effort

Contours join points of equal height. Check the map's contour interval: the vertical difference between neighbouring lines. Do not assume it is the same on every map.

Closely spaced contours indicate a steeper slope than widely spaced contours on the same map. Read the height labels to work out whether your route climbs or descends. Then follow the line all the way back: losing height midway does not cancel the effort of climbing again later.

The difference between the start and the highest point is not necessarily the total ascent. Repeated rises add up. Conversely, a route passing near a summit does not necessarily visit it.

Contours help you ask better questions, but they do not tell you whether a path is muddy, stepped, exposed or manageable with your particular access needs. Use the current route description and access information alongside them. Mountaineering Scotland's map basics explain the terrain-reading skills in more depth.

Break the line into small, checkable stages

Instead of trying to remember a whole loop, choose a sequence of recognisable features. A bridge, a clear junction or a substantial building can be more useful than “carry on for a while”. Work out what you expect immediately before and after each turn.

At a junction, ask three questions:

1. What have I just passed? Does the previous feature fit?
2. What should the next section do? Follow a stream, climb away from it, or stay beside a boundary?
3. What would tell me I had gone too far? Identify that feature in advance, without treating it as a reason to continue when unsure.

A mapped path may be indistinct on the ground. Check your position regularly, rather than waiting until the surroundings stop making sense. If they do not match, pause in a safe place and reassess instead of making the route fit your guess.

A made-up example: the loop that hides a second climb

Imagine a practice route with four labelled points:

• A — start, 100 m above sea level.
• B — first high point, 160 m.
• C — stream-side junction, 120 m.
• D — second high point, 150 m, before returning to A.

If A–B and C–D rise steadily and the other legs descend steadily, the climb from A to B is 60 m and from C to D is another 30 m: 90 m of ascent, not 60 m. Any additional undulations would add more.

Now imagine the turn at C is after a bridge. Your useful note is “cross bridge, then check the junction”, not simply “turn halfway round”. The bridge's position matters more than how neat the loop looks on the screen.

This is a fictional arithmetic and planning exercise, not a route recommendation. Its labels and illustration do not identify a real place, public path or safe crossing.

Measure the route you will actually walk

Trace the bends and every intended leg, including the return from a viewpoint and the connection back to your start. A straight line between endpoints understates a winding path; an out-and-back outing includes both directions.

Keep the measurement separate from your time plan. Distance alone cannot account for climbs, surface, pauses, gates or how your group moves. Our guide to choosing a walk you will enjoy helps put the map alongside those practical decisions.

Record the start clearly. On a British National Grid map, a four-figure reference identifies a 1 km square; a six-figure reference narrows that to a 100 m square. Include the two-letter grid-square identifier when sharing it. Neither is a substitute for checking the exact entrance or meeting point. A pin labelled with a village name may not be where your walk begins.

Make the map usable when you need it

Before leaving, check you can open the right mapping without mobile reception. Download the surrounding area as well as the route, charge your device and protect it from weather. A route trace without its background map is a poor fallback.

Take a suitable backup you know how to use. For hill walking, Mountaineering Scotland's phone-navigation advice covers the practical limits of relying on a device. Practise map-and-compass skills in straightforward conditions; owning the equipment does not teach them.

Leave your route and expected return with someone reliable, and let them know when you are back. Mountain Rescue's preparation advice is worth reading before a more committing outing.

Your final map check

• I can identify the exact start and finish.
• I understand the symbols and access arrangements along the whole route.
• I have checked the climbing, junctions and return leg.
• I know where I can shorten or change the walk without inventing an off-path escape.
• I can use my mapping and backup if reception, weather or visibility deteriorates.

If one of those answers is still a guess, make the plan simpler or get help with that part. A short familiar walk is a good place to practise noticing what the map predicted, and what you actually find.

Last reviewed: 24 October 2026.