Activeforever Plextalk PTR2 Digital DAISY Player and Recorder - Manual (Page 14)

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3.4.1. Navigation levels.
A DAISY book can have up to 6 levels of navigation. The number of levels
in a book will depend on the structure of the original book. The levels are
hierarchical with Level 1 the highest and Level 6 the lowest. This can be
thought of as being similar to the hierarchy of a contents listing in a book,
in the sense that there are major items and then sub items within them
and so on. Every heading that has been coded into a DAISY book will have
an associated navigation level between 1 and 6.
There are no fixed rules about how the DAISY navigation levels should be
used and people's views on how this should be done will vary. For simple
books which only have chapters, it is likely that only one level will be used.
For more complex books, which may have chapters, sections and sub
sections, there might be 3 levels used (Level 1 for chapters, Level 2 for
sections and Level 3 for sub sections). Once the book has been created,
the levels of navigation are fixed and cannot be altered by the reader.
When trying to find a specific part of a book, the reader would tend to use
a higher level (perhaps Level 1 or Level 2) to find the main area of interest,
and would then change to a lower level of navigation to home in on the
information they are looking for. This allows them to bypass large
portions of the book that they have no interest in at that time.
3.4.2. Headings.
In order to use the navigation levels mentioned above, the location of all
relevant navigation points have to be marked in the recording. In the
context of this guide, these markers are called headings. Once a heading
has been inserted into the DAISY recording, it can then be assigned a
navigation level depending on the structure of the original book. When
headings are inserted, they are numbered automatically from 1 upwards,
in the physical order that they appear in the recording.
3.4.3. Pages.
If a DAISY book has been marked for page navigation, the reader can go
direct to specific pages or can skip backwards or forward a page at a time.