Index: trunk/src/org/openstreetmap/josm/gui/NavigatableComponent.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/NavigatableComponent.java	(revision 9946)
+++ trunk/src/org/openstreetmap/josm/gui/NavigatableComponent.java	(revision 9947)
@@ -1638,5 +1638,5 @@
 
     /**
-     * Get a max scale for projection that describes world in 256 pixels
+     * Get a max scale for projection that describes world in 1/512 of the projection unit
      * @return max scale
      */
@@ -1646,5 +1646,5 @@
             world.maxNorth-world.minNorth,
             world.maxEast-world.minEast
-        )/256;
+        )/512;
     }
 }