Hi,
I'd like to update this request and give an example how it can be done nicely.
This is a screenshot showing a PDF manual of a graupner mc22s with navigation structure:
This shows the current DC-16 manual without navigation structure. It is really hard to find the items. You first have to go to the contents page, figure out the page number and enter the page number (+1) to get to the desired content item.
The PDF was created using a Corel PDF engine. I think even this engine supports the navigation structure based on the contents.
Best regards
Onki