Ancillary files needed to generate the vertical grid of GOSI10p3.0-eORCA025, the eddy permitting UK global ocean and sea-ice configuration jointly developed by the Met Office and the National Oceanography Centre under the Joint Marine Modelling Program which employes quasi-Eulerian localised multi-envelope (ME) s-coordinates in the proximity of the Nordic overflows area while it uses z* coordinates with partial steps elsewhere in the domain. The following files are included in this zenodo archive: bathymetry.loc_area-nord_ovf_025.dep2930_sig1_stn9_itr1.nc: file including the model bathymetry and the localization mask. bathymetry.loc_area-nord_ovf_025.dep2930_sig1_stn9_itr1.MEs_novf_gosi10_025_4env_2930_r12_r16-r075-r040-r035_it2-r030.nc: file including the model bathymetry and the four envelopes used to define the localized ME s-coordinate system. maximum_hpge*: files including the maximum spurious currents after 3 months long HPG tests. These files are used to smooth the envelopes and reduce the local HPG errors to an acceptable level (see Bruciaferri et al. 2024 for the details). hpge_timeseries_r12_r16-r075-r040-r035_it2-r030.nc: three months long timeseries of the maximum HPG error associated with the localised ME grid of GOSI10p3.0-eORCA025. The code to generate these files can be found at https://github.com/JMMP-Group/GO-novf .