diff --git a/MapProjections/Shared/Ed50UtmProjection.cs b/MapProjections/Shared/Ed50UtmProjection.cs
index 332a5094..4d2d9c81 100644
--- a/MapProjections/Shared/Ed50UtmProjection.cs
+++ b/MapProjections/Shared/Ed50UtmProjection.cs
@@ -30,10 +30,7 @@ namespace MapControl.Projections
                 = $"PROJCS[\"ED50 / UTM zone {zone}N\","
                 + "GEOGCS[\"ED50\","
                 + "DATUM[\"European_Datum_1950\","
-                + "SPHEROID[\"International 1924\",6378388,297,"
-                + "AUTHORITY[\"EPSG\",\"7022\"]],"
-                + "TOWGS84[-87,-98,-121,0,0,0,0],"
-                + "AUTHORITY[\"EPSG\",\"6230\"]],"
+                + "SPHEROID[\"International 1924\",6378388,297],TOWGS84[-87,-98,-121,0,0,0,0]],"
                 + "PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],"
                 + "UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],"
                 + "AUTHORITY[\"EPSG\",\"4230\"]],"
diff --git a/MapProjections/Shared/Etrs89UtmProjection.cs b/MapProjections/Shared/Etrs89UtmProjection.cs
index 22dbb0dd..71f1ba14 100644
--- a/MapProjections/Shared/Etrs89UtmProjection.cs
+++ b/MapProjections/Shared/Etrs89UtmProjection.cs
@@ -30,10 +30,7 @@ namespace MapControl.Projections
                 = $"PROJCS[\"ETRS89 / UTM zone {zone}N\","
                 + "GEOGCS[\"ETRS89\","
                 + "DATUM[\"European_Terrestrial_Reference_System_1989\","
-                + "SPHEROID[\"GRS 1980\",6378137,298.257222101,"
-                + "AUTHORITY[\"EPSG\",\"7019\"]],"
-                + "TOWGS84[0,0,0,0,0,0,0],"
-                + "AUTHORITY[\"EPSG\",\"6258\"]],"
+                + "SPHEROID[\"GRS 1980\",6378137,298.257222101],TOWGS84[0,0,0,0,0,0,0]],"
                 + "PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],"
                 + "UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],"
                 + "AUTHORITY[\"EPSG\",\"4258\"]],"
diff --git a/MapProjections/Shared/Nad83UtmProjection.cs b/MapProjections/Shared/Nad83UtmProjection.cs
index dd214495..05046a4d 100644
--- a/MapProjections/Shared/Nad83UtmProjection.cs
+++ b/MapProjections/Shared/Nad83UtmProjection.cs
@@ -30,8 +30,7 @@ namespace MapControl.Projections
                 = $"PROJCS[\"NAD83 / UTM zone {zone}N\","
                 + "GEOGCS[\"NAD83\","
                 + "DATUM[\"North_American_Datum_1983\","
-                + "SPHEROID[\"GRS 1980\",6378137,298.257222101],"
-                + "TOWGS84[0,0,0,0,0,0,0]],"
+                + "SPHEROID[\"GRS 1980\",6378137,298.257222101],TOWGS84[0,0,0,0,0,0,0]],"
                 + "PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],"
                 + "UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],"
                 + "AUTHORITY[\"EPSG\",\"4269\"]],"