diff --git a/koki/map.js b/koki/map.js
index 6ca3b62..9cc1477 100644
--- a/koki/map.js
+++ b/koki/map.js
@@ -123,7 +123,15 @@
     	    }
     	    stampget();
     	}
-    	
+    	    	var x =L.latLng([38.89412, 139.81858]);
+    	console.log(latlng.distanceTo(x));
+    	if (latlng.distanceTo(x) < 30) {
+    	    let sengoku =localStorage.getItem('sengoku'); 
+    	    if (sengoku == 0) {
+    		alert("スタンプゲット!!");
+    	    }
+    	    stampget();
+    	}
         });
         
         document.getElementById("start").addEventListener("click", tryWatchGPS);