How to navigate using map and compass on open land

Why heathland navigation is a different skill

British heathland—those open sweeps of heather, gorse and sandy tracks—is glorious to walk, but it can be disorienting. Paths fade, waymarkers vanish, and the horizon becomes a repeating pattern of purple and green. Lowland heath is also one of our rarest habitats, supporting nightjar, Dartford warbler and sand lizard. Good navigation keeps you safe and helps you avoid trampling fragile ground. When the mist rolls in or the light flattens, map and compass skills are not old-fashioned—they are essential.

Get to know your map before you leave the car

Use a detailed 1:25,000 map for heathland. It shows boundaries, contour lines, streams, pits and tracks that may be invisible on the ground. Before you set off, orient the map to the land, fold it so you only see the relevant section, and keep your thumb on your current position. Note the grid magnetic angle printed in the margin—in most of Britain it is small, but in the far west it can be a degree or two, which matters over a long leg.

• Grid north is the direction of the blue grid lines.
• Magnetic north is where your compass needle points.
• Contour interval is usually 5 metres on 1:25,000 maps—each line is a step in height.
• Handrails are linear features: a wall, stream, fence or forest edge.
• Attack points are obvious features you aim for before a precise final bearing.

Taking a bearing that actually works

To follow a bearing from the map, place your compass on the map with its edge along your line of travel. Turn the bezel until the orienting lines line up with the grid lines, and the orienting arrow points to the top of the map. Read the number at the direction-of-travel arrow. Now lift the compass and turn your body until the red magnetic needle sits inside the orienting arrow. The direction-of-travel arrow now points along your bearing. Look up, pick a distant object on that line—a lone pine, a boulder, a gorse bush—and walk to it. Then repeat.

On featureless heath, pacing and timing keep you honest. Count double paces: roughly 65 to 70 for 100 metres on flat ground, more on tussocks. Time yourself: about 4 km/h on firm tracks, 3 km/h on rough heather, and add one minute for every 10 metres of ascent. If you are aiming for a small feature, deliberately aim off to one side, then follow the handrail to your target. That way you know which way to turn when you hit the feature.

Reading contours and using handrails

Heathland is rarely flat. Contour lines reveal re-entrants, spurs and knolls that are easy to miss in a landscape of low scrub. If you need to cross a slope without losing height, contour around it: keep your compass bearing at right angles to the fall line, and check the map to see whether you are drifting up or down. A stream or ditch makes an excellent handrail—follow it uphill to a source, or downhill to a bridge. Walls and fences are obvious, but they can be broken or overgrown, so always have a second feature in mind.

Use collecting features: a pond, a tumulus, a crossing track. Each one confirms your position and shortens the mental leap to the next. Keep your map set—that is, aligned with the ground—by matching features as you walk. If you cannot match anything, stop, take a bearing back to a known point, and work out where you went wrong.

When visibility closes in

Mist, drizzle and flat light are common on British heaths. In poor visibility, shorten your legs. Take a bearing, walk a measured distance, then stop and take another. Use the compass even for short hops between features. If you become uncertain, do not thrash about: sit down, eat something, and reorient the map. A GPS can help, but batteries fail and screens fog. Your compass does not.

Navigate lightly to protect fragile heath

Heathland is a conservation priority. Ground-nesting birds such as nightjar and woodlark are disturbed by walkers cutting across heather between March and July. Rare plants and invertebrates live in the thin, sandy soils. Stick to existing paths where they exist, even if they wander. If you must go off-path, spread out to avoid creating new tracks, and avoid wet flushes and boggy areas. Keep dogs under close control or on a lead during breeding season. Take all litter home, including fruit peel. Never light fires. Close gates behind you, and follow any temporary access restrictions. By navigating carefully, you leave the heath as you found it—and you stay safe while doing so.