diff --git a/koki/map.js b/koki/map.js
index 6dfdbb9..62ee03d 100644
--- a/koki/map.js
+++ b/koki/map.js
@@ -48,6 +48,11 @@
 	    navigator.geolocation.clearWatch(watchId);
 	}
     }
+    function reset() {
+	if (stamp == 1) {
+	    stamp -= 1;
+	}
+    }
     mymap.options.singleClickTimeout = 250;
     mymap.on('singleclick', function(e) {
 	if (true){
@@ -73,4 +78,5 @@
     
     document.getElementById("start").addEventListener("click", tryWatchGPS);
     document.getElementById("stop").addEventListener("click", stopGPS);
+    document.getElementById("reset").addEventListener("click", reset);
 }, false);