Index: /trunk/src/org/openstreetmap/josm/data/coor/LatLon.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/data/coor/LatLon.java	(revision 14793)
+++ /trunk/src/org/openstreetmap/josm/data/coor/LatLon.java	(revision 14794)
@@ -235,5 +235,5 @@
         // (This should almost never happen.)
         if (Double.isNaN(d)) {
-            Logging.error("NaN in greatCircleDistance");
+            Logging.error("NaN in greatCircleDistance: {0} {1}", this, other);
             d = PI * WGS84.a;
         }