"One of the most accurate GPS-based location systems in the world isn’t a hyper-secret military technology or a top-of-the-line scientific device – it’s John Deere’s RTK network, a dual-band GPS system that lets farmers track their planting, harvesting and more to an accuracy of less than an inch." .
“It’s one of the most difficult and exciting programs that Deere’s ever done,” according to Terry Pickett, manager of advanced engineering at the company’s Intelligent Solutions Group."
This article is fantastic and well worth the read, please follow this link to access the full article by Jon Gold at ARN Net. https://www.arnnet.com.au/article/619790/how-john-deere-developed-one-best-gps-locators-world/
Source: Gold, J. Network Wold, ARN Net "How John Deere developed one of the best GPS locators in the world", 25 May 2017.