The terminology in Word is different to that of Adobe Acrobat. In Word, the "Navigation Pane" shows the headings as a clickable, nested list. In earlier versions of Word, this was called the Document Map.

Pretty much the same functionality in Acrobat is known as "Bookmarks". However, in Word, a bookmark is a way of (invisibly) tagging a location for other features to make use of.

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Andrew Lockton
Chrysalis Design, Melbourne Australia