For a long time SEOs have been wondering about the SEO value of named anchors (/page#headline1) linking to some parts of the page. It is often used for FAQ pages where each link qauickly takes you to the chosen answer.
Here’s one of the examples:
Here’s how Google SERPs look like for [Star Wars]:
Notice those mini-sitelinks under result #3:
Now, here’s how the Wiki article is intra-linked:
I am not sure if Wikipedia receives any special treatment regarding on-page navigation but in any case, that’s a huge reason to try adding it to some of your (long) pages:
- Make each link within your page navigation consist of one – three words (no more) – this seems to be easier picked up;
- Place it at the top of your page source code;
- Try using the words “menu” in the CSS class (hat tip to Rishi Lakhani)
I am guessing this will be beneficial to both your users and search crawlers.