Session information is stored automatically for the set of files that were passed in on the command-line and reloaded the next time lnav is executed. The information currently stored is:

Bookmarks and log-time adjustments are stored separately on a per-file basis. Note that the bookmarks are associated with files based on the content of the first line of the file so that they are preserved even if the file has been moved from its current location.

Session data is stored in the ~/.lnav directory.