Thatcham Authorized: All of our trackers are Thatcham Authorized, that means they have already been issue to stringent security testing by Thatcham, so as to determine their security and effectiveness. Some GPS trackers can function indoors, but accuracy may well vary. They may offer a general location rather then a https://medium.com/@trackerfit11/caravan-trackers-and-why-they-matter-for-theft-protection-dd44f62fcad7