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I’m in a park. The grass is being mown by a robot.
(lemmy.world)
We thought the rider fell off or something and it was going to crash. Then it turned and kept mowing. Park Roomba!
Another picture:
I think the wire ones usually do too. When they're out of power and possibly if it rains, they go straight until they reach the wire, and then follow it home to dock.
Yes, I believe the GPS ones are also guided by a wire to find edges and find their way home. The GPS is mostly for theft prevention. Won't work outside a specific area unless it's unlocked from the backend.