PELOTE is an interesting EU research project "focused on how human firefighters and their robot counterparts would make use of a personal navigation and localisation system which could guide their movements, at the same time informing the external command centre of the exact location of each team member.(...) Researchers developed a backpack for the firefighter which uses inertial guidance systems, rather than GPS, to provide the location as shown on a personal display screen, as well as that of the command centre. “The idea is that team members would download a map of the interior before entering the building, and with the start point being calibrated at, say, the entrance, this personal map would enable them to know where they are – no matter how bad the visibility.”" The project website is here.