diff --git a/app/src/main/java/com/example/carcontroller/SLAM/SlamView.java b/app/src/main/java/com/example/carcontroller/SLAM/SlamView.java
index 3479dd6..ada7765 100644
--- a/app/src/main/java/com/example/carcontroller/SLAM/SlamView.java
+++ b/app/src/main/java/com/example/carcontroller/SLAM/SlamView.java
@@ -34,6 +34,7 @@ public class SlamView extends SurfaceView implements SlamUpdater.MapChangedListe
     private ManagedChannel channel;
     private int mapSizePixels;
     private int mapSizeMeters;
+    private String port;
 
     public SlamView(Context context) {
         super(context);
@@ -56,7 +57,7 @@ public class SlamView extends SurfaceView implements SlamUpdater.MapChangedListe
     private void init() {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
         String host = prefs.getString("host", "10.0.0.53");
-        String port = prefs.getString("zmqPort", "5050");
+        port = prefs.getString("zmqPort", "5050");
         String gRPCPort = prefs.getString("port", "50051");
         mapSizePixels = Integer.parseInt(prefs.getString("MAPSIZEPIXELS", "540"));
         mapSizeMeters = Integer.parseInt(prefs.getString("MAPSIZEMETRES", "10"));
@@ -93,7 +94,11 @@ public class SlamView extends SurfaceView implements SlamUpdater.MapChangedListe
             }
         };
         // use async grpc method, ZMQ doesn't need to connect straight away.
-        stub.startMapStreaming(SlamDetails.newBuilder().setMapSizePixels(mapSizePixels).setMapSizeMeters(mapSizeMeters).build(), response);
+        stub.startMapStreaming(SlamDetails.newBuilder()
+                .setMapSizePixels(mapSizePixels)
+                .setMapSizeMeters(mapSizeMeters)
+                .setPort(Integer.parseInt(port))
+                .build(), response);
     }
 
     public void stop() {