# EPUBCheck NAV-010: nav links to a website, how to fix it

Source: https://epubcc.com/epubcheck/nav-010/ (updated 2026-11-04)

EPUBCheck NAV-010 is an error message: “"…" nav must not link to remote resources; found link to "…".” A table of contents, page list or landmarks entry links to a remote resource. Links in these three navs must point to a document inside the EPUB, and EPUBCheck names the nav type and the URL it found.

- Official message (EPUBCheck 5.4.0): "%1$s" nav must not link to remote resources; found link to "%2$s".
- Default severity: Error

## Typical causes

- A table of contents entry that links to a website, such as the publisher's page.
- A landmarks entry pointing to an online version of the cover or the index.

## How to fix it

1. Point the entry to a document in the EPUB, or a fragment in it.
2. Move the web link into the content, for example on a copyright or about page, and link that page from the table of contents if needed.
3. Other nav types (a custom list) may link outside the EPUB; only toc, page-list and landmarks may not.
4. Rebuild the EPUB and run EPUBCheck again to confirm the message is gone.

## When it's not this

If the link points inside the EPUB but to a file that is missing, that is RSC-007.

## Sources

- EPUB 3.3, §7.3 The nav element: restrictions: https://www.w3.org/TR/epub-33/#sec-nav-def-model (read 2026-11-04)

Message text and severity: EPUBCheck (W3C, BSD-3-Clause). Explanation: EpubCC.