This project is investigating and developing innovative location and navigation technology based on the novel concept of location signatures. These are local spatial variations of environmental features such as terrain height, magnetic fields, road signs and road surface irregularities, and can be measured using low-cost sensors. This new technique will mitigate GNSS vulnerabilities for mission-critical applications, such as tracking emergency service vehicles and high-value assets. The necessary location-signature database can be generated by users as part of their day-to-day operations and shared cooperatively, removing the need for expensive surveys and keeping it up to date. Project duration: 2012-2015; Sponsor: EPSRC and Terrafix, Researcher: Debbie Walter.