The user can navigate forward or backward within the journal, one entry at a time. The goal was to have the journal make sufficient references to things past that it might make as good reading backwards as forwards. Additionally, there are four 'sections' of entries which are meant to be a small story unit together. Reading each of these sections should be doable in arbitrary order. This aims to give the user flexiblity of how they navigate without giving total random access to the journal.
Comments in the margins made by the journal author make references to other sections of the journal, which can be jumped to. This provides the most immediate way of navigating from one 'section' to another without hitting all the intermediate entries.
The journal is being given to his thesis advisor due to some unusual circumstances. The journal therefore comes with a cover letter which contains links to entry points within the journal, and is meant to entice the reader (this is the starting point).
On each page, there is a pyramid logo, which takes the reader to a list of chronologically previous journal entries in the same section, as well as a link back to the cover letter.
On each page there is also a map logo, which takes the reader to map of the are which allows the user to again jump to the beginning of each section. This doesn't actually provide any new links that the cover letter does not, but provides a different way of looking at the material and creates a bit of an illusion of depth.