Start With the Tide, Not the Route

On most coastal walks it is the tide, not the terrain, that decides whether the day goes well. Before you choose a route — or your start time — look up the tide times for the nearest standard port. Harbour noticeboards, coastal car parks and local guidebooks all carry them, and the figures matter more than you might think. Note the high and low water times and the height in metres above chart datum. A low water of 1.1 metres in the morning may be only 0.3 metres in the evening; that difference decides whether a sandy crossing is firm underfoot or a knee-deep wade.

Check the state of the tide too. Spring tides, which fall near the new and full moon, run higher and lower than average and push stronger currents through inlets and around headlands. Neap tides are gentler. Sea fog, sea mist and a stiff onshore wind can arrive with little warning, so read the inshore forecast for the day rather than relying on last night's glance at the sky.

Reading a Tide Table Without Guesswork

The shape of a tide matters as much as its times. Over roughly six hours the water does not fall evenly: it moves slowly at first, then fast, then slows again. The old rule of twelfths is still the most useful mental shortcut. Divide the total range into twelve parts — about one part falls in the first hour, two in the second, three in the third, three in the fourth, two in the fifth and one in the sixth.

• Always aim to cross a tidal section on a falling tide. If you are late, the water continues to drop and you keep your escape route.
• Never plan a crossing on a rising tide unless the section is trivially short and you can clearly see the far side.
• Add a buffer of at least an hour either side of low water before committing to a beach or causeway.
• Identify your escape routes on the map — a slipway, a set of steps or a path up to the cliff top.

Fasten Your Boots Properly

Coastal ground flatters you on the flat and punishes you on the rough. Trail shoes are excellent for dry, well-made paths, but the moment the route includes rocky coves, steep grass, wet wooden boardwalks or mud, you will want walking boots with a proper grip and some ankle support. Deep tread is what keeps you upright on wet seaweed, glazed rock and damp clay.

Pair them with wool-blend socks rather than thin cotton, and carry a spare pair in a dry bag — wet feet are the fastest route to blisters and an early finish. For shingle and soft sand, loosening the laces slightly across the top of the foot helps. Whatever you wear, break it in before the day.

Pace Yourself on the Cliff Paths

Distance alone is a poor guide on the coast. A cliff path may climb and drop a hundred metres between two coves that sit only a mile apart on the map, and the constant ascent adds up quickly.

A workable rule for most walkers is roughly two miles per hour on the flat, plus an extra hour for every 1,000 feet (300 metres) of climbing. Add time for stiles, gates, photographs, sandy descents and the slow, careful work of a steep, loose slope. If your route involves 2,000 feet of cumulative ascent over ten miles, plan for seven hours of walking rather than five.

Set a turn-back time before you leave — usually half your available daylight — and honour it whatever the view looks like around the corner. Tell someone where you are going and when you expect to be back, and remember that mobile signal vanishes in many coastal combes and under cliffs.

Watch the Ground and the Weather

Cliff edges crumble. After heavy rain, and especially along soft geology, the lip of a path can be undercut for a metre or more beneath a healthy-looking fringe of grass. Keep well back from the edge, do not sit on overhangs, and treat cracked or sunken ground near the rim as a warning. Paths that have been rerouted inland are usually rerouted for a reason.

Coastal weather changes faster than inland weather. Carry a waterproof jacket and an extra warm layer even in July, and pack sun cream and a hat, because sea breezes hide strong sun. Take more water than you think you need, plus a hot drink in a flask for breezy lunch stops. Sea fog can remove your landmarks within minutes; if it arrives, navigate by map and compass rather than by coastline shape.

Enjoy the Day, Sensibly

The best coastal walks are the ones where the planning disappears into the background. Check the tides, choose footwear that suits the ground, pace yourself against the ascent rather than the mileage, and keep an eye on both the sea and the sky. Leave the exposed sections for calm days, save the clifftop traverses for settled weather, and let a short walk in the morning turn into a long one only if the conditions invite it.

Then stop for a moment at the headland, feel the wind, and remember that a well-planned day by the sea is one of the finest things these islands offer.