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Full local/open source lawnmower?
(lemm.ee)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
You can root the Gardena gateway and control their mowers locally with this: https://github.com/andrexp/gardena-local-control
I don't think they have mowers with GPS though. Also, some of their mowers don't use the gateway.