Yep you are correct! We are using a Raspberry Pi and RTK GPS for autonomous control. It was all autonomous in our announcement video, and in the last 7 days acorn has traveled 58 kilometers autonomously. Some of those were slow days as I was working on it, but it had a new best day recently with 14.3km on pure autonomous solar power. It is currently just driving back and forth down the winding test row you saw in the video as we work on making sure continuous daily operation is reliable, and we will be expanding the driving area soon. 
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