It is desirable that "bread crumb (or topic pass)" exists. Also, if you have a parent site such as a satellite site, the link to the parent site also helps you understand the "current location" in a broad sense. For example, an undergraduate site with a separate university site has a link to that university.
|Principle||Operable||User interface components and navigation must be operable.|
|Guideline||Navigable||Provide ways to help users navigate, find content, and determine where they are.|
|Information on the position of the user in the set of web pages can be used.|