HI, I tried to configure a grid shift as explained in this guide: https://docs.geoserver.org/latest/en/user/configuration/crshandling/coordtransforms.html#examples
using a gsb file. In the epsg_operations.properties file (inside user_projection) I wrote the following line: 3857,3003=PARAM_MT["NTv2",PARAMETER["Latitude and longitude difference file", "NadRoma40.gsb"]] and I put the NadRoma40.gsb file inside the same folder (file verified with other applications and working correctly). Now when I try to reproject from 3857 to 3003 if I click on "Show transformation details" I see that GeoServer has implemented my configuration (it shows me exactly what I wrote in the epsg_operation file), but the conversion does not work correctly. The log tells me "Point (1306188.4848936629, 5743812.429289647) is not covered by 'NadRoma40.gsb' NTv2 grid, it will not be moved." but I am sure that the point is contained by the grid. I also tried using the gsd file described in your guide and trying the coordinates system in your guide, but nothing with that either. I'm currently testing everything on a GeoServer version 2.23.1 Daniele Maggiolo
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