Index: applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/tilesources/ScanexTileSource.java
===================================================================
--- applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/tilesources/ScanexTileSource.java	(revision 32761)
+++ applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/tilesources/ScanexTileSource.java	(revision 32769)
@@ -61,4 +61,13 @@
         super(info);
         String url = info.getUrl();
+
+        /**
+         * The formulae in tileYToLat() and latToTileY() have 2^8
+         * hardcoded in them, so explicitly state that.  For now
+         * the assignment matches OsmMercator.DEFAUL_TILE_SIZE, and
+         * thus is extraneous.  But let it be there just in case if
+         * OsmMercator changes.
+         */
+        this.tileSize = 256;
 
         for (ScanexLayer slayer : ScanexLayer.values()) {