Watching well is the whole point

Britain's coastline is around 18,000 miles of cliffs, estuaries, sandbanks and sea lochs, and it holds some of the best marine wildlife watching in Europe. Grey seals hauled out on Norfolk and Orkney shores, basking sharks cruising the Hebrides and Cornwall in summer, harbour porpoise rolling through the gaps between headlands, bottlenose dolphins patrolling Cardigan Bay and the Moray Firth, and seabird cities that number in the tens of thousands. All of it is free, and most of it is visible from dry land.

The animals are there because the water is working properly. When we crowd them, we take something back — a pup loses a feed, a dolphin pod abandons a feeding bay, a seabird colony flushes and the gulls move in. None of the following needs expensive kit. It is mostly about position, distance, timing and keeping quiet.

Start from the shore

The best view is almost always from land. On a boat you are a large, unpredictable object moving through an animal's world; from a headland you are a speck on the horizon. Cliff-top viewpoints, promontories, breakwaters and estuary hides let you watch behaviour rather than chase it.

• Pick a spot with height and a wide horizon, and get the sun and wind behind you so your scent and glare drift away from the water.
• Binoculars of 8x42 or 10x42 are ideal. Add polarised sunglasses — they cut surface glare and let you see beneath it.
• Time your visit around a big tide. Two hours either side of low water often concentrates fish, birds and cetaceans in the same channel.
• Take a flask and give it a full hour of stillness. Most encounters happen to people who have stopped moving.

If you want photographs, use reach instead of approach. A long lens from a cliff path will beat a phone at ten metres from a boat, and it leaves the animal exactly where it was.

Keep your distance, and hold it

Distance is the single most useful thing you can control. As a working guide: stay at least 100 metres from seals, dolphins, porpoise and basking sharks, and 300 to 400 metres from larger whales. Around seal haul-outs in the breeding season, double it. Approach from behind and to the side, never head-on and never by cutting across an animal's path, and let curiosity do the rest. Dolphins and seals will often come to you if you simply stop.

On the water, put the engine in neutral and drift. Avoid sudden throttle changes, don't circle, and don't line up a boat between a mother and her calf. A useful habit is the three-strikes rule: if an animal changes what it is doing three times because of you — diving early, turning away, speeding up — you have had your encounter. Leave it alone and move on slowly.

Quiet, still and predictable

Noise travels far underwater and carries along cliffs. Shouting, banging hatches, revving engines, slamming car doors and drone buzz all disturb wildlife long before you see a reaction. Keep your voice low, move slowly, and make your movements up and down rather than side to side — that reads as a harmless object rather than a predator.

Drones deserve a special mention. Even a small one flying above a colony or a haul-out is stressful, and it is illegal to disturb certain protected species this way. If you want aerial images, buy a licensed photograph instead.

Dogs should stay on a short lead wherever there are birds, seals or nests. A dog off the path can clear an entire beach of roosting birds in seconds, and seals will stampede into the water if approached.

Spring: give mothers and young room

Spring and early summer are when disturbance does the most damage. Seabird colonies are packed with eggs and chicks, common seals are pupping on sheltered shores, and grey seal pups may still be on the beach. A mother that is flushed repeatedly may abandon a pup or a chick, and a pup separated from its mother on the water has very poor odds.

• Stay on marked paths on cliff tops and never walk above or below nesting ledges.
• Keep at least 200 metres from seals with pups, and never walk between a pup and the water.
• If you find a seal pup alone on a beach, it is almost certainly not orphaned — the mother is nearby, waiting for you to leave.
• Keep away from crab-pot lines, fishing boats and harbour walls where seals gather in spring.

Never chase, never feed, never touch

Feeding changes behaviour permanently. It draws animals into boat traffic and harbours, teaches them to beg instead of hunt, and puts things in their stomachs they cannot digest. Baiting seals for photographs is harmful and, in many places, an offence.

Chasing is simply exhausting. A dolphin that has been pursued across a bay has burned energy it needed for hunting or nursing. Touching is worse: seals bite, and they carry infections that can pass to humans, and handling a wild animal causes severe stress.

If you find a stranded, injured or entangled animal, do not attempt a rescue yourself. Keep people and dogs well back, note the location and call the relevant rescue organisation or the coastguard. For a live stranding, that call is the most useful thing you will do all day.

Know the signs, and the rules

Wildlife tells you when you have gone too far. Watch for head slaps and tail slaps from dolphins, a seal rushing into the water, birds lifting off a cliff en masse, or repeated early dives. Any of those means back off now, not slowly.

Disturbance is also a legal matter. Whales, dolphins, porpoise, basking sharks and seals are protected under the Wildlife and Countryside Act 1981 and the Conservation of Habitats and Species Regulations 2017, and seals have additional protection in Scotland. Notices at reserves and beaches set out local restrictions; read them and follow them, even when the rules are stricter than you expected.

Finally, record what you see. Sending your sightings to a regional recording scheme helps build the picture that protects these animals and the places they use. Quiet watching, logged properly, is how the coast stays worth visiting.