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Re:Cheap Centimeter-Precision GPS for Cars, Drones, Virtual ... by gvb on Wednesday May 06, 2015 @10:13PM (#9502962)
See also Piksi - "Low-cost RTK GPS receiver (centimeter level precision) with open source software and board design targeted at UAVs."

https://www.kickstarter.com/projects/swiftnav/piksi-the-rtk-...

http://gpsworld.com/what-happened-to-piksi-the-995-rtk-gnss-...

Re:Cheap Centimeter-Precision GPS for Cars, Drones, Virtual ... by ivereninov on Thursday May 07, 2015 @07:50AM (#9504375)
Also Reach, newer project with more features and half the price. Runs RTKLIB open-source software. https://www.indiegogo.com/projects/reach-first-affordable-rt...