I have seen a neighbor's house with a robot lawn mower, and it uses the exact same track to return to the charging station with the result being some serious tracks in the lawn, otherwise it appears to do a very good job. My point, check with the manufacturer to see exactly how these work, my understanding is some of the newer units use GPS to cut the grass, no idea how well this works.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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