Root Mean Square of the 3D positioning error as a function of time. The results correspond to a permanent receiver (ebre), situated at 229 km from the nearest reference station (mall) used to compute the ionospheric Fast-PPP model. The navigation solution is reset every 2 hours during the data collection, which lasted from Day Of Year (DOY) 169 to 200 in 2014. The dual-frequency ionosphere-free solution (Classic PPP, black pluses) is compared with the enhanced positioning using ionosphere data from the Fast-PPP (red crosses). More details in Fast Precise Point Positioning: A System to Provide Corrections for Single and Multi-Frequency Navigation, NAVIGATION, Journal of The Institute of Navigation, Vol. 63, No. 3, Fall 2016, pp. 231-247. DOI: 10.1002/navi.148.