diff --git a/map/gps/gps-chase.js b/map/gps/gps-chase.js
index ee09d9c..cee78cc 100644
--- a/map/gps/gps-chase.js
+++ b/map/gps/gps-chase.js
@@ -85,6 +85,14 @@
     function checkButton(){
     answer = document.getElementById( "mytext" ).value ;
     msg.innerText = '送信できました';
+    var latlng1 = L.latLng([38.879232, 139.853824]);
+     if(latlng.distanceTo(latlng1) < 50){
+	if(answer == 2236){
+		alert("正解です");
+	}else{
+		alert("不正解です");
+	}
+     }
     }
     
     function onError(err) {