Plotter Down, Kettle On: The Paper Navigation Kit That Actually Gets You Home

There is a particular silence on a boat when the chartplotter goes black. The phone in its waterproof case is down to eight per cent, someone asks whether you have paper, and you produce a chart folded into an origami swan and a compass that seems to be pointing at the biscuit tin. That is not a backup navigation kit. That is a talisman with a lanyard.

A proper paper backup does not need to be elaborate. It needs to answer four blunt questions: where am I, which way am I going, what is the tide doing, and what is the next safe thing to do? For UK coastal and inland boaters, that means charts, plotting tools, tide information, a compass, laminated pilotage notes and one sensible electronic fallback. The rest is practice. Without practice, you have bought stationery.

Start with what you are actually backing up

Navigation is not one job. The plotter gives you position, course, speed, depth, tide and a comforting little boat icon. A paper kit will not replace all of that. It will get you home if you can plot a position, read a bearing, work a course to steer and recognise the buoy, bridge or lock you are looking at.

So build the kit around the trip you actually do. A Solent weekend sailor needs current charts and tide tables. A narrowboater on the Kennet & Avon needs a good canal guide, bridge numbers, lock names and a map that does not rely on signal. A Bristol Channel sailor needs a healthy respect for tide and a hand-bearing compass. One kit does not fit every boat, but the principle does: buy for your water, not for the chandlery catalogue.

Charts: current, corrected, and kept flat

A chart is the backbone. For coastal work, an Admiralty Small Craft folio or a current Imray chart for your area is sensible. Inland, a Nicholson or Pearson guide plus the relevant Canal & River Trust map is the practical equivalent. The important word is current. A secondhand chart is a false economy if it is several editions old and has not been corrected.

Check the edition and the chart corrections. UKHO Notices to Mariners are not glamorous reading, but a buoy that moved two seasons ago is exactly the sort of detail you want on paper. Keep the chart in a flat waterproof folio, not jammed behind the fuel tank. A chart that has to be ironed before use is not a backup.

Plotting tools that work in a cockpit

A Portland plotter or Breton plotter, a pair of dividers, a soft pencil, an eraser and a waterproof notebook will cover most of it. Traditional parallel rules look wonderful and can be deeply annoying on a bouncing cockpit table. If you already use them, fine. If you are buying from scratch, a plotter is easier to use one-handed while wearing gloves.

Do not forget the humble pencil. A 2B is better than a Biro that skids across a damp chart. Keep a spare. Keep the eraser tethered. Keep the whole lot in one grab bag so it does not migrate to the chart table, the galley drawer and the car boot by turns.

Tide tables, almanacs and local knowledge

Tide is not a detail in UK waters; it is often the whole story. A current tide table or almanac for your area is essential, along with any local harbour authority information for secondary ports. Learn how to work a standard port and a secondary port rather than just squinting at a phone app. Apps are useful, but they are not the backup when the phone is the thing that failed.

Inland, tide gives way to river levels, lock times and bridge heights. A laminated card with your regular route's low bridges, winding holes, services and lock opening times is worth more than a fancy gadget that needs charging.

The compass and the deviation card

A hand-bearing compass earns its place on coastal boats. Check it against known transits and keep a simple deviation card if your boat has anything magnetic near the compass. The compass in your phone is a clever toy, but it is not a marine bearing compass and it is inside a device that may be wet, flat or busy telling you about a restaurant.

For inland boating, a baseplate compass is handy for general direction, but the map, bridge numbers and river features usually do more work. Either way, know which way north is without asking a screen.

Laminates: the cockpit brain

A laminated passage plan is the unsung hero of the backup kit. Put the rough plan, waypoints, tides, hazards, bail-out ports, VHF channels and marina phone numbers on one sheet. For inland, use a dry-wipe card for the day's locks, bridge heights and planned stopping point. It gives the crew something useful to hold and gives you a fighting chance when the electronics have gone quiet.

One sensible electronic fallback

A handheld VHF with DSC and GPS is the electronic backup that earns its keep, because it covers communication and a basic position fix. A simple handheld GPS can be useful, but do not buy a second plotter just to feel safe. A power bank and a waterproof phone with offline charts are fine as a secondary layer, not as the foundation.

Practise before the screen goes blank

This is the bit that separates a kit from a talisman. On a familiar trip, in good weather, turn the plotter off for an hour. Plot your position every fifteen or twenty minutes using bearings, transits, depth and dead reckoning. Write it in the notebook. Compare it with the GPS afterwards. Do it with the kettle on, not with a harbour wall approaching.

Inland, try navigating a stretch you know using only the guide, bridge numbers and map. Brief the crew on what to do if the plotter dies. A short, low-stakes rehearsal is worth more than a hundred pounds of extra kit you have never opened.

A realistic UK kit list

• Current chart or canal guide for your area
• Portland or Breton plotter, dividers, pencils, eraser
• Hand-bearing compass and deviation card
• Current tide table or almanac
• Laminated passage plan and pilotage notes
• Waterproof notebook and flat chart folio
• Handheld VHF with DSC and GPS, plus spare batteries or power bank
• Chart corrections and a quick check of local notices

The money-saving rule is simple: buy the current chart, a plotter you understand and a compass you trust. Skip the decorative brass instruments, the ancient chart bundle and the second electronic plotter. Then spend an evening practising. A backup navigation kit is not a purchase; it is a habit. The best time to start is when the plotter still works and the kettle is already on.