Reading Ordnance Survey Maps for Coastal Footpaths

Why the coast reads differently on a map

Inland walking spoils you. A footpath crosses two fields, meets a lane, and the map and the ground agree with each other for mile after mile. The coast is a different creature. Cliff edges move, landslips redraw the line, and a slipway that was there on the last edition may now end in mid-air. Add a rising tide and a sea fret rolling in off the water, and you have a landscape where the map is less a description and more a set of instructions you have to interpret.

That is not a reason to leave the map at home. It is a reason to learn to read it properly — especially the small symbols that tell you whether you are about to climb a stile, push through a kissing gate or walk a permissive path that the landowner could close tomorrow.

Choose the right scale before anything else

For coastal footpaths, the 1:25,000 Explorer series is the one you want. At that scale the mapmakers have room to show stiles, gates, footbridges, footpath numbers and the boundary of access land, all of which vanish at 1:50,000. The Landranger is excellent for planning a whole stretch of coast in one sheet, but it is a poor companion at a broken stile in a Force 6.

• 1:25,000 — rights of way shown as green dashes, permissive routes in orange, National Trails marked with an acorn. This is your walking map.
• 1:50,000 — useful for the wider picture and road access, less so for the last hundred metres of a cliff path.
• Tide tables — not part of the map, but they belong in the same pocket. Sections of coast path are cut off at high water, and the map will show you exactly where.

Paths, permissive routes and the coastal margin

A green dashed line is a public right of way: you have the legal right to be there. An orange dashed line is permissive, which means the landowner has granted access voluntarily. In practice permissive paths are often better surfaced and better signed, but they are also more fragile. Many permissive arrangements allow closure for a set number of days each year, and coastal erosion is a common reason for a diversion. Never assume the orange line you walked last spring still exists.

Access land is shown by a pale wash with a darker boundary, and it is where coastal walking becomes gloriously free — you may wander off the line entirely, subject to local exclusions marked by a purple or pink hatch. Watch for those hatches near cliff tops: they usually mean unstable ground, nesting birds or a firing range. The map is telling you something, and it is not a suggestion.

Stiles, gates and the furniture of a coastal path

These are the symbols that turn a line on paper into a route you can actually walk. On an Explorer map, a stile appears as a small ladder-like mark sitting on the path, and a gate as a short bar across it. Kissing gates and bridle gates have their own variations, and footbridges get a neat little bridge symbol that is worth hunting for when a stream crosses the path at the bottom of a combe.

Why does this matter? Because in poor visibility the furniture is your confirmation. If the map says stile and you meet a gate, you are at the wrong gate. If the map shows a footbridge and you are facing a ford, the tide or the recent rain has changed the ground under you — and you should be looking for the alternative line, usually a short way upstream.

• Count the boundaries. Field edges, walls and fence lines let you pace your progress between features.
• Use the numbers. Footpath numbers on the map often match the waymark discs on the ground.
• Check the grid reference at every junction. A six-figure reference takes ten seconds and prevents a very long detour.

Cliffs, tides and weather on the same sheet

Coastal maps carry information that inland maps simply do not need. Contours bunch into dense brown packs where the cliff falls away, and hachures on the seaward side warn of steep or unstable ground. The high and low water marks are both shown, with sand, mud and shingle differentiated by texture — useful when you are judging whether a beach will carry you round a headland or whether the sand is actually a very shallow, very sticky mudflat.

Look for the slipways, breakwaters, groynes and lifeboat stations; they are not decoration. A slipway is often the only safe way off a beach at the end of a walk, and a coastguard station on the map is a useful thing to be able to name if you need to describe your position. Coastal fog and driving rain can reduce visibility to a few dozen metres in minutes, so pick out a handful of catching features before you set off: a headland, a car park, a stream mouth, a distinctive bend in the path. Inland walkers navigate by features; coastal walkers survive by them.

Habits worth building

Carry the map in a clear case and keep it out rather than folded in a rucksack. Mark your intended route lightly in pencil so you can see at a glance where you should be, and note the grid references of two or three bail-out points where the path meets a road or a village. Photograph the relevant section of the map on your phone as a backup, but treat the paper as primary — batteries fail, screens crack, and salt water is utterly indifferent to either.

Above all, match the map to the ground rather than the other way round. When they disagree on the coast, the ground is usually right, and it is usually because something has changed since the last survey. Read the stiles, trust the symbols, and let the map do what it was drawn to do: get you home along a coastline that is never quite the same twice.