A Moving Hide with a Front-Row Seat

A ferry is the finest seabird hide in Britain. It covers water no headland can reach, it holds a steady course through tide races and upwellings, and it has a heated cabin for when the wind turns. From the Irish Sea to the Pentland Firth, a crossing gives you gannets at eye level, shearwaters arcing past the bow and skuas shadowing the wake. Best of all, the birds come to you. You need binoculars, patience and a rail to lean on — because a ferry is also a working ship in a stretch of sea that birds use for feeding, rafting and resting. Disturbance matters. Flushed auks burn energy they cannot spare, harried skuas lose a hard-won meal, and scattered rafts of shearwaters waste precious foraging time. The good news is that the responsible way to watch is also the most rewarding: look, don't chase, and keep your distance.

Getting Your Kit and Timing Right

An 8x42 pair of waterproof binoculars is the classic deck choice: bright, wide and forgiving when the ship rolls. If your hands are steady, 10x42 will pull in skuas at range. Keep them on a strap round your neck and a microfibre cloth in your pocket — salt spray will find the lenses within the hour. Add a windproof shell, a hat you can tie on, thin gloves, and shoes with real grip on wet steel decking. If you suffer from seasickness, take medication well before you sail, not when you start to feel queasy.

Light matters more than luck. Check your sailing time against sunrise and sunset; dawn and dusk produce the best passage movements, and storm petrels often appear in the wake at last light. Spring and autumn are prime for skuas and shearwaters, summer for breeding auks and gannets, winter for divers, grebes and scoter flocks. Note the forecast wind too — a brisk onshore blow pushes birds closer to the route.

Finding the Best Spot on Deck

• Stern: the churn attracts gannets, fulmars and gulls, and following birds often track the ship for miles.
• Bow: unbeatable for shearwaters and skuas crossing ahead of the vessel.
• Leeward side: sheltered, warmer and easier for steady viewing through binoculars.
• Windward side: cleaner air and fewer people, but brace yourself and keep one hand free.

Stay in public areas and never block stairways, doorways or crew routes. Keep clear of the funnel, where exhaust haze spoils the view. Scan the horizon with the naked eye first to pick up movement, then raise your binoculars to confirm. Ten-minute counting blocks work well: watch steadily, note what passes, then rest your eyes.

Know What You're Watching

• Northern gannet: big, white, black wingtips, plunge-diving at speed into the wash. Immatures are mottled grey-brown.
• Great skua (bonxie): heavy and brown with bold white wing flashes; bullies kittiwakes and gannets into dropping their catch.
• Arctic skua: slimmer, with pointed tail streamers, dark or pale morphs; mostly an autumn passage bird.
• Manx shearwater: small, black above and white below, stiff-winged arcs low over the swell, often in loose lines.
• Sooty shearwater: uniformly dark with silvery underwings, peaking August to October.
• Storm petrel: tiny and bat-like with a white rump, pattering over the surface — never dazzle them with bright lights.

Add fulmar, kittiwake, guillemot, razorbill, puffin, red-throated diver and common scoter to your mental checklist, and you have most of what a British crossing can throw at you.

The Golden Rule: Leave No Wake of Disturbance

The test is simple. If a bird changes what it is doing because of you, you are too close. Where distance is in your hands, aim for at least 100 metres, and never close on a raft of auks or a feeding flock below 50 metres. On deck, that means no shouting, no feeding scraps, no chumming and no playback — recordings that pull birds in are a form of harassment, not a trick of the trade.

Drones are another firm no. They are unwelcome and often prohibited aboard, and their noise disturbs birds at range you cannot even see. If the ship passes close beneath cliffs, keep voices low and resist the urge to point. Never ask crew to divert or slow for a bird; a working vessel has a schedule, and safety comes first.

Be careful with what you share, too. Precise locations of nesting colonies and rafting flocks of Schedule 1 species should stay vague. Under the Wildlife and Countryside Act 1981, disturbing certain birds at their nests is an offence, and a casual post can send a crowd to a sensitive site.

Turning a Crossing into a Record

Note the time, sea state, wind direction and your position along the route, then count in blocks. Write it down while it is fresh, and pass your records to your county bird recorder or local bird club — ferry routes are under-watched, and the data is genuinely valuable. While you are at it, log the cetaceans, basking sharks, ocean sunfish and jellyfish. Over a few seasons you will build a picture of what each crossing holds, month by month, which is far more satisfying than a single tick. Enjoy the sea air, watch the birds behave naturally, and you will come ashore having added something rather than taken it away.