Index: trunk/src/org/openstreetmap/josm/data/projection/Projections.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/projection/Projections.java	(revision 9579)
+++ trunk/src/org/openstreetmap/josm/data/projection/Projections.java	(revision 9580)
@@ -126,7 +126,7 @@
                 "Greek Geodetic Reference System 1987", "GGRS87",
                 Ellipsoid.GRS80, -199.87, 74.79, 246.62));
-        datums.put("hermannskogel", new ThreeParameterDatum(
+        datums.put("hermannskogel", new SevenParameterDatum(
                 "Hermannskogel", "hermannskogel",
-                Ellipsoid.Bessel1841, 653.0, -212.0, 449.0));
+                Ellipsoid.Bessel1841, 577.326, 90.129, 463.919, 5.137, 1.474, 5.297, 2.4232));
         datums.put("ire65", new SevenParameterDatum(
                 "Ireland 1965", "ire65",