The article linked below explains the PPP-RTK GNSS correction services offered by u-blox, called PointPerfect. It describes how PointPerfect works, including its ability to provide precise, real-time positioning information even in challenging environments. The article also highlights some of the benefits of using PointPerfect, such as improved accuracy, availability, and reliability. Additionally, it describes the different subscription plans available for PointPerfect, along with the technical specifications of the service.