In this research, the effect of Precise Point Positioning (PPP) method on the position accuracy of GNSS points has been investigated and 8 TUSAGA-Active points were used. In an effort to improve the GNSS position accuracy, 24-hour RINEX data was evaluated using the GAMIT/GLOBK that academic software. The 24-hour datas for each stations divided into subgroups of data with TEQC software. These subgroups of data are 2-4-6-8 and 12 hours. Then, all subgroups of data were evaluated with online-based CSRS-PPP software. By accepting the 24-hour data of GAMIT/GLOBK software as correct, the mean squared errors were calculated from the results of the data sets obtained from CSRS-PPP. Furthermore, the relationships between measurement time/positioning accuracy were determined. These results were compared with Eckl et al. 2001. The position accuracies obtained from the PPP solutions were found to be compatible with the position accuracy relations obtained in Eckl et al. (2001).