Another interesting external show-case which demonstrates how you can build any form of application-specific navigation. You, as application developer, can decide whether you allow no navigation at all, use some of the internal navigation modes or code your own way to map any user-input to any form of camera motion.
The shown auto-navigation scenario is also interesting for people which try to find the shortest way as quickly as possible in an unknown building. This is an important question for e.g. search and rescue teams.