A Thatcham machine refers into a security item which has been examined and Qualified by Thatcham Exploration. This could involve alarms, immobilisers, or trackers intended to stop theft. Certification usually means the system meets rigorous specifications and is trusted by insurers. Also generally known as stolen car or truck spot, https://medium.com/@trackerfit11/why-choosing-a-thatcham-tracker-strengthens-vehicle-security-6b79d8a9c256