Robot lawn mowers have been with us for a while now, and while the original models relied on boundary wires to make sure they didn't stray into borders, newer lawnbots are using more sophisticated navigation methods – those that don't require wires.
Modern robot lawn mowers use satellite positioning data, combined with RTK (real-time kinematic) positioning to improve accuracy, to find their way around your yard. Since this method of navigation relies on a decent satellite connection, most lawnbots will also come with a some sort of secondary sensor that's designed to enable them to continue mowing in areas of poor signal. That might be radar or LiDAR (which is used in most of today's best robot vacuums), or perhaps a camera.
