User navigation is the set of nodes and pages that are owned by the user. They are part of the user's dashboard.
Three files configure the user navigation (navigation.xml, pages.xml and portlet-preferences.xml). They are located in the {templateLocation}/{ownerType}/{predefinedOwner} directory with ownerType is user and predefinedOwner is username that want to create the navigation. For example, if administrator want to create navigation for user root, he has to locate the configuration files in portal.war/WEB-INF/conf/portal/user/root