diff --git a/map/gps/gps-chase.js b/map/gps/gps-chase.js
index a11861a..db02fac 100644
--- a/map/gps/gps-chase.js
+++ b/map/gps/gps-chase.js
@@ -82,7 +82,7 @@
 	}
     }
     
-    function checkButton(){
+    function checkButton(pos){
     answer = document.getElementById( "mytext" ).value ;
     msg.innerText = '送信できました';
     var latlng = L.latLng([pos.coords.latitude, pos.coords.longitude]);