There is a particular flavour of regret reserved for the sailor who crosses to France, fires up the chartplotter off Cherbourg, and discovers the chart card in the slot stops at the English coast. I have watched it happen on a friend's boat in the Solent the night before a crossing, a frantic hunt for a chandler still open, then a small fortune spent on the only Europe card in stock. A little planning the winter before would have saved him both the money and the panic.
Buying a chart card for French waters is not complicated once you understand three things: which brand your plotter speaks, how the regions are carved up, and what the tiers actually add. Get those straight and the purchase is twenty minutes online, not a dockside emergency.
Your plotter decides your brand
This is the part newcomers get wrong. A chart card is not universal. The card must match the cartography your chartplotter is built to read, and the brands have consolidated. Garmin now owns Navionics, so a modern Garmin plotter happily reads Navionics cards. Raymarine, B&G, Simrad and Lowrance plotters read C-Map and, in many cases, Navionics too. Furuno, Humminbird and the rest each have their preferences.
So step one is to read your plotter's manual or check the maker's compatibility list before you buy anything. The wrong card is a dead card. If you are buying a new plotter at the same time, factor the chart cost into the decision, because the cards are a recurring expense and the brands price their regions differently.
If you have not committed to a fixed plotter yet and run charts on a tablet, the calculation changes entirely, and I would read the navigation apps for French waters alongside this, since an app subscription can replace the physical card for many coastal cruisers.
How the regions are carved up
Chart makers sell France inside larger European zones, not as a standalone country, which is good news because one card usually covers far more than you need. Navionics, for instance, packages France within a Central and West Europe area that takes in the Channel, the Biscay coast and the western Mediterranean. C-Map and Garmin's own cartography slice things similarly.
The practical upshot: a single large-zone card covers a UK boat's whole likely route, the south coast of England, the Channel crossing, the Brittany and Biscay coasts, and on round to the Riviera. You rarely need two cards for a French cruise. Where you do need to think harder is if you are pressing on past France, toward Spain and Portugal or deep into the Med, when checking the zone boundary on the maker's coverage map before you pay matters.
What the tiers actually buy you
Every brand sells the same charts at two or three price points, and the marketing makes the difference sound bigger than it is. Here is the honest version for French coastal cruising.
- The base tier gives you the vector chart: depths, contours, buoyage, harbour layouts. For straightforward coastal hopping in good visibility, this is genuinely all you need.
- The middle and top tiers add the features that earn their money inshore: high-resolution bathymetry that shades the seabed in fine detail, satellite photo overlays of harbour approaches, tidal height and stream prediction built into the chart, and dock-to-dock routing.
For France specifically, two of those upgrades are worth paying for. The tidal data is invaluable on the Atlantic side, where Brittany and the Channel run big ranges and fierce streams, and having the prediction overlaid on the chart saves you juggling an almanac. The satellite overlay earns its keep threading the rock-strewn approaches of the pink granite coast or picking your way into a Breton river on a falling tide.
Prices in 2025 sit where you would expect. A large-zone Navionics Platinum card for Europe runs around 260 euros from European chandlers, with the simpler Navionics+ tier noticeably cheaper. C-Map and Garmin's own cards price in the same broad band. None of it is small money, which is why getting the brand and zone right first time matters.
Updates, and why the cheap card on eBay is a trap
A chart card is not a one-time buy. Hazards move, buoys shift, depths are resurveyed, and a French wreck marked since your card was pressed is exactly the sort of thing you do not want to learn about by hitting it. The modern cards come with a period of free updates, usually downloaded over wi-fi to the card via the maker's app, so you can refresh before a season.
This is where the bargain card on an auction site bites. An old card may be cheap because it is years out of date and out of its update window, which for French waters is a real safety problem and, depending on your flag state's rules, potentially a legal one too. France expects you to navigate on up-to-date charts, and a current card is part of meeting the legal requirement to carry updated charts in France. The wider question of paper versus electronic charts in France is worth a read too, because the legal expectation differs depending on which you rely on. Buy current, update before you go, and keep the subscription alive.
What about SHOM, the French official charts?
UK and Dutch visitors often ask whether they need the French official charts from SHOM, the national hydrographic service, the way they might carry Admiralty charts at home. The short answer for the leisure cruiser is no, not as a separate purchase. Navionics, C-Map and Garmin all license the underlying survey data, including French sources, so a current commercial card already reflects the official surveys for French waters. SHOM does sell its own paper and raster charts, and they are superb, but you are buying them for their detail and as a paper backup, not because your plotter card is somehow missing French data.
Where SHOM matters is the rock detail. The Breton coast is some of the most intricate pilotage in Europe, and a large-scale SHOM paper chart or a SHOM-based raster open on a tablet can show a clarity of named rocks and transits that a vector card simplifies away at certain zoom levels. If your French cruising is all sandy Med anchorages, skip it. If you are picking through the Chenal du Four or the approaches to the pink granite coast, a SHOM large-scale chart in the cockpit beside the plotter is cheap insurance.
A backup plan that costs almost nothing
I run a fixed plotter with a current Platinum card as my primary, and a tablet running a chart app as my backup, fed AIS from the same transponder. The two systems use different chart sources, which is the point: if one developer's data has an error or my card corrupts, the other is unlikely to share the same fault. For the price of an app subscription you buy genuine redundancy, and the tablet is the thing I actually pick up to read a quick distance or zoom into an anchorage.
Whichever route you take, do the homework this winter rather than in a Cherbourg chandler at closing time. Confirm your plotter's brand, buy the single large-zone card that covers your whole French route, pay for the tier that includes tidal data and satellite overlays, and update it before you slip the lines. That is the difference between a chartplotter that helps you and a glowing rectangle that stops at the wrong coast.
