I certainly agree with Northernfarmer.
A hint is you can use the magnifying glass (at top right) to search for information like “tablet”
So get a computer and use it as “lightbar” together with a receiver like F9P + ANN-MB-00 antenna
Harrowing work fine without RTK, I even did one season seeding without RTK.
Do NOT construct a lightbar, but instead use your time to go for autosteer (Hydraulic or Motor)
Today I would use the new All in One PCB All in One PCB
Price can be under 1000 € for it all (plus your own time)
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