diff --git a/1218kadai.js b/1218kadai.js
new file mode 100644
index 0000000..3f82e41
--- /dev/null
+++ b/1218kadai.js
@@ -0,0 +1,64 @@
+document.addEventListener("DOMContentLoaded", function () {
+    var mymap = L.map("locationmap").setView([38.891, 139.824], 16);
+    L.tileLayer('https://{s}.tile.osm.org/{z}/{x}/{y}.png', {
+        attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
+    }).addTo(mymap);
+
+    var markers = L.layerGroup().addTo(mymap);
+
+    var watchId = null; 
+    var targetLocation = L.latLng(38.891, 139.824); 
+    var proximityThreshold = 100; 
+
+    var statusElement = document.getElementById("status");
+
+    function stopLogging() {
+        if (watchId !== null) {
+            navigator.geolocation.clearWatch(watchId);
+            watchId = null;
+        }
+        statusElement.textContent = " - 停止中";
+        console.log("ロギング停止");
+    }
+
+   
+    function startLogging() {
+        stopLogging(); 
+        watchId = navigator.geolocation.watchPosition(onSuccess, onError, {
+            enableHighAccuracy: true,
+            timeout: 5000,
+            maximumAge: 0
+        });
+        statusElement.textContent = " - ロギング中";
+        console.log("ロギング開始");
+    }
+
+    
+    function onSuccess(position) {
+        var lat = position.coords.latitude;
+        var lng = position.coords.longitude;
+        var currentLocation = L.latLng(lat, lng);
+
+     
+        var distance = currentLocation.distanceTo(targetLocation);
+
+
+        var popupMessage =
+            distance <= proximityThreshold
+                ? "目標地点まで" + Math.round(distance) + "メートル！近づきました！"
+                : "現在地: lat=" + lat + ", lng=" + lng + "<br>目標地点まで" + Math.round(distance) + "メートル";
+
+        markers.addLayer(L.marker(currentLocation).bindPopup(popupMessage).openPopup());
+        mymap.panTo(currentLocation);
+
+        console.log("現在地: 緯度 " + lat + ", 経度 " + lng + ", 距離: " + distance + "メートル");
+    }
+
+    function onError(error) {
+        console.error("位置情報取得失敗", error);
+    }
+
+  
+    document.getElementById("start").addEventListener("click", startLogging);
+    document.getElementById("stop").addEventListener("click", stopLogging);
+});