diff --git a/commander.html b/commander.html
index b18623c..36e0eee 100644
--- a/commander.html
+++ b/commander.html
@@ -38,6 +38,12 @@
       <button id="login">login</button>
    </div>
    <main>
+      <div id="refresh" class="btn">
+         <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-arrow-clockwise" viewBox="0 0 16 16">
+            <path fill-rule="evenodd" d="M8 3a5 5 0 1 0 4.546 2.914.5.5 0 0 1 .908-.417A6 6 0 1 1 8 2z"/>
+            <path d="M8 4.466V.534a.25.25 0 0 1 .41-.192l2.36 1.966c.12.1.12.284 0 .384L8.41 4.658A.25.25 0 0 1 8 4.466"/>
+          </svg>
+      </div>
       <table>
          <thead>
             <tr>
@@ -76,6 +82,7 @@
       var boatsLocked = [];
 
       loginEl.addEventListener('click', login);
+      document.getElementById('refresh').addEventListener('click', refreshAll);
 
       function login(e)
       {
@@ -88,7 +95,13 @@
       function onOpen(e)
       {
          conn.send(passEl.value + ";4675;" + Math.floor(new Date().getTime()/1000.0));
+         refreshAll()
+      }
+
+      function refreshAll()
+      {
          reqBoats();
+         reqLockedBoats();
          reqClients();
       }
 
@@ -128,6 +141,11 @@
          conn.send(passEl.value + ";boats");
       }
 
+      function reqLockedBoats()
+      {
+         conn.send(passEl.value + ";locked");
+      }
+
       function reqClients()
       {
          conn.send(passEl.value + ";clients");
diff --git a/ground-station.py b/ground-station.py
index fd26b85..c071517 100644
--- a/ground-station.py
+++ b/ground-station.py
@@ -69,7 +69,7 @@ async def take_controll(client, boat):
 async def free_boat(boat):
     """make boat available for next client"""
     for client in Clients:
-        if client["boat"]['id'] == boat:
+        if client["boat"] is not None and client["boat"]['id'] == boat:
             client["boat"] = None
             break
     for b in Boats:
@@ -81,7 +81,7 @@ async def free_boat(boat):
 async def lock_boat(boat):
     """lock a boat so client can't take controll over it"""
     for client in Clients:
-        if client["boat"]['id'] == boat:
+        if client["boat"] is not None and client["boat"]['id'] == boat:
             client["boat"] = None
             break
     for b in Boats:
@@ -136,7 +136,7 @@ async def on_message(message, client):
                 print("WARN: controll cmd (" + client['id'] + ") to None: " + data[2])
             elif client['boat']['lastMsg'] + BOAT_DATA_INTERVAL_MAX < datetime.timestamp(datetime.now()):
                 # print("INFO: controll cmd (" + client['id'] + ") to " + client['boat']['name'] + ": " + data[2])
-                sendToBoat(client['boat'], "d:" + data[2] + "\n")
+                await sendToBoat(client['boat'], "d:" + data[2] + "\n")
                 client['boat']['lastMsg'] = datetime.timestamp(datetime.now())
         elif data[1] == "getlog" and client['id'] == ADMIN_ID:
             await getlog(client, data)