diff --git a/index.html b/index.html
index 402cbe0..ae9bda3 100644
--- a/index.html
+++ b/index.html
@@ -41,6 +41,9 @@
             <button @click="sendCommandSetAdvertName" class="border border-gray-500 px-2 bg-gray-100 hover:bg-gray-200 rounded">
                 SetAdvertName
             </button>
+            <button @click="sendCommandSetAdvertLatLon" class="border border-gray-500 px-2 bg-gray-100 hover:bg-gray-200 rounded">
+                SetAdvertLatLon
+            </button>
             <button @click="sendCommandAddUpdateContact" class="border border-gray-500 px-2 bg-gray-100 hover:bg-gray-200 rounded">
                 AddUpdateContact
             </button>
@@ -152,6 +155,11 @@
                 await this.device.sendCommandSetAdvertName(name);
 
             },
+            async sendCommandSetAdvertLatLon() {
+                const lat = 123;
+                const lon = 456;
+                await this.device.sendCommandSetAdvertLatLon(lat, lon);
+            },
             async sendCommandAddUpdateContact() {
                 const publicKey = new Uint8Array([148, 63, 175, 162, 88, 212, 192, 40, 214, 185, 213, 140, 42, 145, 194, 186, 70, 71, 112, 68, 0, 192, 65, 4, 105, 143, 230, 50, 162, 79, 247, 192]);
                 const type = Constants.AdvType.Chat;
diff --git a/src/constants.js b/src/constants.js
index 73eacc8..cd4662a 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -18,6 +18,7 @@ class Constants {
         SyncNextMessage: 10, // done
         SetRadioParams: 11, // done
         SetTxPower: 12, // done
+        SetAdvertLatLon: 14,
     }
 
     static ResponseCodes = {
diff --git a/src/device.js b/src/device.js
index a9c8329..44bfa3f 100644
--- a/src/device.js
+++ b/src/device.js
@@ -166,6 +166,14 @@ class Device {
         await this.sendToRadioFrame(data.toBytes());
     }
 
+    async sendCommandSetAdvertLatLon(lat, lon) {
+        const data = new BufferWriter();
+        data.writeByte(Constants.CommandCodes.SetAdvertLatLon);
+        data.writeUInt32LE(lat);
+        data.writeUInt32LE(lon);
+        await this.sendToRadioFrame(data.toBytes());
+    }
+
     async readLoop() {
         try {
             while(true){