The plots below present the long-term tracking performance of YLDZ00TUR (Istanbul, TUR). The numbers are obtained using the G-Nut/Anubis software (versions 2.2.1 (before 2019-03-05), 2.2.4 (from 2019-03-05 to 2019-09-01), 2.3.0 beta (from 2019-09-01 to 2020-09-15), 2.3 (from 2020-09-15 to 2021-06-21) and 3.1 (after 2021-06-21), developed by the Geodetic observatory Pecný, Czech Republic. Input files are the daily RINEX 2 and RINEX 3 (if available) observation files. Only healthy satellites are taken into account (even if tracking unhealthy satellites is still recommended). For RINEX 2, only and GPS and GLONASS data are considered.