diff --git a/worldmap.html b/worldmap.html
index 9968ec8..f6a004a 100644
--- a/worldmap.html
+++ b/worldmap.html
@@ -531,7 +531,9 @@ then by default <code>⌘⇧m</code> - <code>ctrl-shift-m</code> will load the m
     <p>Holds all the points in memory, so if you have a lot of points held for a
     large depth then memory usage may become excessive.</p>
     <p>To delete a track send a msg.payload containing both the name of the object and
-    set deleted to true - for example <code>msg.payload = { "name":"Fred", "deleted":true }</code></p>
+    set deleted to true - for example <code>msg.payload = { "name":"Fred", "deleted":true }</code>.</p>
+    <p>This will also delete the point. If you just want to clear the track set the msg.payload to the 
+    name+"_", for example <code>msg.payload = { "name":"Fred_", "deleted":true }</code></p>
 </script>
 
 <script type="text/javascript">
diff --git a/worldmap.js b/worldmap.js
index df2ac15..3d62c4c 100644
--- a/worldmap.js
+++ b/worldmap.js
@@ -264,9 +264,16 @@ module.exports = function(RED) {
             if (msg.hasOwnProperty("payload") && msg.payload.hasOwnProperty("name")) {
                 var newmsg = RED.util.cloneMessage(msg);
                 if (msg.payload.deleted) {
-                    delete node.pointsarray[msg.payload.name];
+                    if (msg.payload.name.substr(-1) === '_') {
+                        var a = node.pointsarray[msg.payload.name.substr(0,msg.payload.name.length-1)].pop();
+                        node.pointsarray[msg.payload.name.substr(0,msg.payload.name.length-1)] = [ a ];
+                        node.send(newmsg); 
+                    }
+                    else {
+                        delete node.pointsarray[msg.payload.name];
+                    }
                     //newmsg.payload.name = msg.payload.name + "_";
-                    node.send(newmsg);  // send the track to be deleted
+                    node.send(newmsg);  
                     return;
                 }
                 if (!msg.payload.hasOwnProperty("lat") || !msg.payload.hasOwnProperty("lon")) { return; }