Long-term tide gauge records provide valuable insights to sea level variations, but interpretation requires an accurate determination of the associated vertical land motion. Within the Tide Gauge Benchmark Monitoring Working Group of the International GNSS Service, we performed a dedicated reprocessing (1994-2020) for GNSS stations co-located with tide gauges. Based on 341 stations the GFZ contribution to the third TIGA reprocessing provides vertical land motion rates for 230 stations at or close to recently active tide gauges. We limited the processing to GPS observations.

To ensure the highest accuracy, we used the classical network approach with ambiguity fixing according to Ge et al. (2005) but without orbit determination. Therefore, we introduced the orbit and clock products provided in the GFZ repro3 solution (Männel et al., 2020, 2021). The processing strategy follows the current geodetic IERS conventions (https://www.iers.org/IERS/EN/Publications/TechnicalNotes/tn36.htm) and the IGS repro3 settings (http://acc.igs.org/repro3/repro3.html). The processing is described in detail in our dedicated Analysis Center Notes (ftp://isdcftp.gfz-potsdam.de/gnss/products/tiga3/gfz_tiga3.acn). In line with repro3 we applied the antenna correction file igsR3_2077.atx where the GPS transmitter offsets were adjusted to the pre-launch calibrated Galileo PCOs provided by EUSPA. The derived station coordinates are thus given in the consistently derived IGSR3 reference frame whose terrestrial scale differs by around 1.2 ppb from the ITRF2014 scale as described in IGS-mail 8026 (https://lists.igs.org/pipermail/igsmail/2021/008022.html). More details are presented in the associated publication (Männel et al., 2022). Despite daily coordinates, we also estimated hourly zenith total delays and daily gradients to account for tropospheric delays. The results are provided in the following formats:

• troposphere delays and gradients (GFZ1R3TFIN_0000_01D_01H_TRO.TRO.gz, data format: tro: https://files.igs.org/pub/data/format/sinex_tro_v2.00.pdf),

• station coordinates (GFZ1R3FIN_0000_01D_01D_SOL.SNX.gz,data format: snx: https://www.iers.org/IERS/EN/Organization/AnalysisCoordinator/SinexFormat/sinex.html),

The file naming follows the IGS Long Product Filename Convention (http://acc.igs.org/repro3/Long_Product_Filenames_v1.0.pdf). All files are .gz compressed.