We thought the rider fell off or something and it was going to crash. Then it turned and kept mowing. Park Roomba!
Another picture:
this post was submitted on 01 May 2024
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GPS are very fancy ones, unless that's changed since I last looked into it. A buried wire, "invisible fence", has been the norm for all consumer grade ones I've seen.
That's the style we have as well. In addition to the wire it also detects if it bumps into walls.
The ones I have seen are GPS locked and they automatically "return home" to the charger when rain drops are detected.
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.