Why Paper Still Earns Its Place

A passage plan that lives only inside a chartplotter is a plan with a single point of failure. Batteries flatten, connections corrode, screens crack, and damp finds its way into everything on a small boat. None of that is an argument against electronics — they are superb tools — but it is an argument for carrying the same plan on paper as well.

The paper chart also changes how you think. At a scale where you can see the whole coast at once, headlands, deep water and awkward corners sit alongside each other in a way a zoomed-in screen never quite shows. Spread it on the saloon table, arm yourself with a soft pencil, dividers and a plotter, and you can annotate, rub out and re-work the plan until it makes sense. When the lights go out, that chart is still readable by torchlight.

Reading the Coast Before You Read the Tide

Start with the big shapes. Trace the coastline from your departure point to your destination and mark every headland you must round, because headlands are where coastal passages are won and lost. Portland Bill, Start Point, St Alban's Head, the Lizard, Bardsey Sound, the Mull of Galloway — each has its own temper, and each needs a decision attached to it before you leave the berth.

• Note the overfalls and race symbols, and the tidal stream arrows close inshore where the flow accelerates.
• Identify the nearest all-weather anchorage or harbour on each stretch, and check whether it is tenable in the forecast wind.
• Mark the depth contours that matter to you, not the ones that don't.
• Ask of every headland: if the engine died here, which way would I go?

That single question, asked at the chart table in comfort, saves an enormous amount of improvisation later.

Finding the Tidal Gates

A tidal gate is simply a window when the stream carries you rather than fights you. Get it wrong off a prominent headland with wind against tide and you will meet steep, short seas; get it right and you slip past with a fair two or three knots under you, which on a six-knot yacht is the difference between a comfortable day and a miserable one.

Use the tidal diamonds on the chart or the tidal stream atlas for the relevant area, and work out when the stream turns in your favour at each gate. Remember that springs and neaps behave differently, and that your time of departure shifts with every day of the trip. Build the day around the gates, not around breakfast. Note also where the flow runs hardest across an estuary mouth or a narrows — the Menai Strait and the Swellies are a fine example of a passage that must be planned to the hour.

Choosing and Marking Safe Water

Now draw the safe corridor. For each leg, pencil in a clearing bearing or a transit that keeps you a known distance off a hazard, and hatch the areas you will not enter — overfalls, unlit rocks, shoal patches, firing ranges. Write the safe limits in the margin where you can read them at a glance from the cockpit, not buried in a list.

Add the soundings you would expect to see as you pass: a depth that confirms your position is often more useful than a waypoint. Remember that charted depths are reduced to chart datum, so the number on the paper is the least water you can expect, not the water you have. Where a shoal has a drying height, work out the height of tide you need to clear it and note the rule of twelfths so you can do the sum quickly at sea.

Writing the Passage Plan Down

A plan you cannot see is not a plan. Make a simple table: each leg, the course to steer, distance, expected boat speed, the tidal stream you expect and the resulting ETA. Add the tidal gate times, a primary contingency port and a secondary one, and a note of what would make you turn back or divert. Include the harbour entrance details — leading marks, sill heights, call signs and channels — so nobody has to hunt for them under pressure.

Leave a copy ashore with someone reliable, and keep a second clean copy in a waterproof wallet at the chart table.

Keeping the Paper in the Loop

Use both systems together. Plot a fix on the chart every hour, whether or not the plotter agrees; on a clear day, practise a three-point fix or a transit to keep the skill alive. There is no shame in navigating the old way in familiar waters — that is precisely where you should rehearse it.

Finally, look after the tools themselves. Keep charts rolled rather than folded, store them somewhere dry, keep pencils soft and rubbers gentle, and update anything you rely on. A well-used chart, soft with age and covered in light pencil, is one of the quiet pleasures of coastal sailing — and on the day the screen goes dark, it is the thing that gets you home.