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Because farmers aren't (for the most part) software hackers, and the equipment they pay top dollar for is using the subscription service Also, the subscription

• Animats 4y ago
  The John Deere RTK Radio 900, which does exactly that, costs about $1000 used. You put it on a tripod next to the field, or on top of a building. If you want season to season repeatability, it has to be in the same place. This is GPS correction, not a completely standalone navigation system. There are more components for big farms. There are repeaters to re-broadcast the correction signal, which in the US is in the 900MHz ISM band. Some Deere dealers have their own stations throughout a farming community. There's a fee to use that. It's like having your own server instead of using "the cloud". Works fine, takes more attention.