diff --git a/worldmap.js b/worldmap.js
index cb15b19..3f3b2d9 100644
--- a/worldmap.js
+++ b/worldmap.js
@@ -142,7 +142,7 @@ module.exports = function(RED) {
             client.on('close', function() {
                 delete clients[client.id];
                 node.status({fill:"green",shape:"ring",text:"connected "+Object.keys(clients).length,_sessionid:client.id});
-                node.send({payload:{action:"disconnect", clients:Object.keys(clients).length}, topic:"worldmap", _sessionid:client.id});
+                node.send({payload:{action:"disconnect", clients:Object.keys(clients).length}, topic:node.path.substr(1), _sessionid:client.id});
             });
         }
 
diff --git a/worldmap/leaflet/TileLayer.GrayscaleWMS.js b/worldmap/leaflet/TileLayer.GrayscaleWMS.js
index d6c42bc..ed0583d 100644
--- a/worldmap/leaflet/TileLayer.GrayscaleWMS.js
+++ b/worldmap/leaflet/TileLayer.GrayscaleWMS.js
@@ -35,8 +35,9 @@ L.TileLayer.GrayWMS = L.TileLayer.WMS.extend({
             var imgd = ctx.getImageData(0, 0, this._layer.options.tileSize, this._layer.options.tileSize);
             var pix = imgd.data;
             for (var i = 0, n = pix.length; i < n; i += 4) {
-                pix[i] = pix[i + 1] = pix[i + 2] = (3 * pix[i] + 4 * pix[i + 1] + pix[i + 2]) / 8;
-                //pix[i] = pix[i + 1] = pix[i + 2] = (2 * pix[i] + 3 * pix[i + 1] + 3 * pix[i + 2]) / 6;
+                //pix[i] = pix[i + 1] = pix[i + 2] = (3 * pix[i] + 4 * pix[i + 1] + pix[i + 2]) / 8;
+                // Lighten the scale slightly to make markers more obvious
+                pix[i] = pix[i + 1] = pix[i + 2] = (3 * pix[i] + 4 * pix[i + 1] + pix[i + 2]) / 8 * 3 / 4 + 64;
             }
             ctx.putImageData(imgd, 0, 0);
             this.removeAttribute("crossorigin");