TRX systems, which builds non-GPS geolocation tools did a demonstration at the Joint Navigation Conference in Dayton, OH.
From the agenda:
NEON Squad Tracker – 3D location with offline operation. Plug-ins have been developed that enable the solution to operate using Nett Warrior or ATAK Android Apps and their established networks for sharing PLI. Map data may be exported from the command interface and side loaded when available; map data access is not required though it can be used to improve location accuracy when available.
Applications for NEON solutions include military, public safety, industrial workers, private security, enterprise workflow and signal mapping in GPS-denied and urban areas.