In February 2026, the UK Hydrographic Office quietly made a pretty significant announcement about how it produces Admiralty Standard Nautical Charts. If we buy a new edition chart this year, it might look a bit different to the one we’re used to. Here’s what’s changed and why.

The problem UKHO was trying to solve

Maintaining traditional paper charts is genuinely labour-intensive. Each chart had to be updated by hand by cartographers, applying Notices to Mariners corrections, adjusting symbols, redrawing features. With paper chart sales falling, it was getting hard to justify keeping that whole production pipeline running indefinitely.

At the same time, UKHO was already maintaining a completely separate digital dataset: Electronic Navigational Charts, or ENCs. These are the official vector charts that feed ECDIS systems on commercial vessels and, increasingly, the apps and chartplotters leisure sailors use. ENCs are updated constantly. So UKHO was effectively doing the same job twice, once for paper and once for digital.

What’s changed

New edition Admiralty SNCs are now being generated directly from ENC data, rather than produced through the traditional manual cartographic process.

The underlying hydrographic information is the same. The chart is still official, still compliant, and still safe to navigate from. But because the chart is now rendered from vector digital data rather than drawn cartographically, some features and symbols are presented slightly differently to what we’d see on older editions.

UKHO describes these as “subtle changes to the depiction of features or symbol presentation.” Their page on new edition SNCs (linked below) sets out the specifics.

Why this matters

The practical upside is that paper charts are now far more sustainable to keep producing. UKHO is no longer running two separate maintenance pipelines. They maintain the ENC data, and the paper chart follows from it. As a result, the commitment to continue producing paper charts is now open-ended rather than tied to a countdown. The previous “until at least 2030” deadline is gone.

For those of us who rely on paper charts, whether for RYA training, legal requirements on coded vessels, or good old-fashioned chartwork, that’s genuinely good news.

What to watch out for

If we pick up a new edition of a chart we’ve used before, some things may look a touch unfamiliar. The data is identical, but the rendering is different in places. For students working through chartwork exercises, it’s worth being aware that older chart copies used in training materials may not match a brand-new chart from a chandler.

Worth double-checking which edition we’re working from, and if something looks unfamiliar, checking UKHO’s new edition presentation notes before assuming there’s an error.

What to do now

Nothing urgent. Paper charts remain official and valid. If we’re buying new editions, we may notice the visual differences, but the information is authoritative.

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Official source: UKHO – Sustaining the future of ADMIRALTY Standard Nautical Charts

Changes to chart presentation: UKHO – Additional information on new edition SNCs

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