Index: trunk/src/org/openstreetmap/josm/data/coor/LatLon.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/coor/LatLon.java	(revision 12736)
+++ trunk/src/org/openstreetmap/josm/data/coor/LatLon.java	(revision 12737)
@@ -348,4 +348,31 @@
         }
         return d;
+    }
+
+    /**
+     * Returns the heading that you have to use to get from this lat/lon to another.
+     *
+     * Angle starts from north and increases counterclockwise (!), PI/2 means west.
+     * You can get usual clockwise angle from {@link #bearing(LatLon)} method.
+     * This method is kept as deprecated because it is called from many plugins.
+     *
+     * (I don't know the original source of this formula, but see
+     * <a href="https://math.stackexchange.com/questions/720/how-to-calculate-a-heading-on-the-earths-surface">this question</a>
+     * for some hints how it is derived.)
+     *
+     * @deprecated see bearing method
+     * @param other the "destination" position
+     * @return heading in radians in the range 0 &lt;= hd &lt; 2*PI
+     */
+    @Deprecated
+    public double heading(LatLon other) {
+        double hd = atan2(sin(toRadians(this.lon() - other.lon())) * cos(toRadians(other.lat())),
+                cos(toRadians(this.lat())) * sin(toRadians(other.lat())) -
+                sin(toRadians(this.lat())) * cos(toRadians(other.lat())) * cos(toRadians(this.lon() - other.lon())));
+        hd %= 2 * PI;
+        if (hd < 0) {
+            hd += 2 * PI;
+        }
+        return hd;
     }