Indoor navigation system for applications, where reliable localization in 3D in buildings or even outdoor is required without the need / availability of any infrastructure (i.e. no radio based localization like WLAN, no computer vision (due to dust or destroyed environment), no GNSS, simply nothing.
iTHESEUS is a light-weight, fully self-sufficient, simple to use inertial solution for in-door navigation and localization. It is also suitable for walking robots like Boston Dynamics' SPOT robot.
See also iLIANE for the localization and navigation of vehicles (land, sea) in GNSS denied environment.