I have no need to transform from ATS77 to NAD27 but it sounds like a good idea if one had to. I have 2 GSB Files PE7783V2.gsb from the GeoCalc Software designed by GeoNB for PEI to transform from ATS77 to NAD83 and NTv2.gsb which is a national gsb for going from NAD27 to NAD83. I came back to this post because after installing QGIS3 and removing QGIS2 I lost all my old custom CRS's that were tied into using those GSB's to transform coordinates, and they seemed to work because the coordinates were slightly different than if I did not have the +XYZ.gsb in the PROJ4. I am trying to add my new gsb files directly to the srs database so that they come up as transformation options in QGIS3. I added them to the database table but they do not come up as options in the CRS screen. Has anyone tried adding it directly?
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