Copter: send LOCAL_POSITION_NED

very useful for GPS-disabled operation and EKF debugging

ArduCopter/GCS_Mavlink.pde

@@ -487,6 +487,11 @@ bool GCS_MAVLINK::try_send_message(enum ap_message id)
         send_location(chan);
         break;
 
+    case MSG_LOCAL_POSITION:
+        CHECK_PAYLOAD_SIZE(LOCAL_POSITION_NED);
+        send_local_position(ahrs);
+        break;
+
     case MSG_NAV_CONTROLLER_OUTPUT:
         CHECK_PAYLOAD_SIZE(NAV_CONTROLLER_OUTPUT);
         send_nav_controller_output(chan);
@@ -819,6 +824,7 @@ GCS_MAVLINK::data_stream_send(void)
 
     if (stream_trigger(STREAM_POSITION)) {
         send_message(MSG_LOCATION);
+        send_message(MSG_LOCAL_POSITION);
     }
 
     if (gcs_out_of_time) return;