diff --git a/clover_description/launch/spawn_drone.launch b/clover_description/launch/spawn_drone.launch
index 078f8442..14ddff04 100644
--- a/clover_description/launch/spawn_drone.launch
+++ b/clover_description/launch/spawn_drone.launch
@@ -10,8 +10,9 @@
     <arg name="gps" default="true"/>
     <!-- Use physics parameters from CAD programs -->
     <arg name="use_clover_physics" default="false"/>
+    <arg name="hitl" default="false"/>
 
-    <arg name="cmd" default="$(find xacro)/xacro $(find clover_description)/urdf/clover/clover4.xacro main_camera:=$(arg main_camera) rangefinder:=$(arg rangefinder) led:=$(arg led) gps:=$(arg gps) maintain_camera_rate:=$(arg maintain_camera_rate) use_clover_physics:=$(arg use_clover_physics)"/>
+    <arg name="cmd" default="$(find xacro)/xacro $(find clover_description)/urdf/clover/clover4.xacro main_camera:=$(arg main_camera) rangefinder:=$(arg rangefinder) led:=$(arg led) gps:=$(arg gps) maintain_camera_rate:=$(arg maintain_camera_rate) use_clover_physics:=$(arg use_clover_physics) hitl:=$(arg hitl)"/>
     <param command="$(arg cmd)" name="drone_description"/>
     <!-- Note: -package_to_model replaces all mentions of "package://" with "model://" in urdf URIs -->
     <node name="$(anon spawn)" output="screen" pkg="gazebo_ros" type="spawn_model" args="-urdf -param drone_description -model clover -z 0.3"/> 
diff --git a/clover_description/urdf/clover/clover4.xacro b/clover_description/urdf/clover/clover4.xacro
index 5df65aa8..fb9aa211 100644
--- a/clover_description/urdf/clover/clover4.xacro
+++ b/clover_description/urdf/clover/clover4.xacro
@@ -7,6 +7,7 @@
   <xacro:arg name="gps" default="true"/>
   <xacro:arg name="maintain_camera_rate" default="false"/>
   <xacro:arg name="use_clover_physics" default="false"/>
+  <xacro:arg name="hitl" default="false"/>
 
   <xacro:include filename="clover4_base.xacro" />
   <xacro:include filename="../sensors/rpi_cam.urdf.xacro"/>
diff --git a/clover_description/urdf/clover/clover4_gazebo.xacro b/clover_description/urdf/clover/clover4_gazebo.xacro
index b9738b34..bb0de1e2 100644
--- a/clover_description/urdf/clover/clover4_gazebo.xacro
+++ b/clover_description/urdf/clover/clover4_gazebo.xacro
@@ -53,14 +53,14 @@
       <mavlink_addr>INADDR_ANY</mavlink_addr>
       <mavlink_tcp_port>4560</mavlink_tcp_port>
       <mavlink_udp_port>14560</mavlink_udp_port>
-      <serialEnabled>false</serialEnabled>
+      <serialEnabled>$(arg hitl)</serialEnabled>
       <serialDevice>/dev/ttyACM0</serialDevice>
       <baudRate>921600</baudRate>
       <qgc_addr>INADDR_ANY</qgc_addr>
       <qgc_udp_port>14550</qgc_udp_port>
       <sdk_addr>INADDR_ANY</sdk_addr>
       <sdk_udp_port>14540</sdk_udp_port>
-      <hil_mode>false</hil_mode>
+      <hil_mode>$(arg hitl)</hil_mode>
       <hil_state_level>0</hil_state_level>
       <send_vision_estimation>0</send_vision_estimation>
       <send_odometry>1</send_odometry>
diff --git a/clover_simulation/launch/simulator.launch b/clover_simulation/launch/simulator.launch
index 059dc1e5..fe9a845a 100644
--- a/clover_simulation/launch/simulator.launch
+++ b/clover_simulation/launch/simulator.launch
@@ -1,5 +1,6 @@
 <launch>
     <arg name="type" default="gazebo"/> <!-- gazebo, jmavsim, none (only clover packages) -->
+    <arg name="mode" default="sitl"/> <!-- sitl or hitl -->
     <arg name="mav_id" default="0"/>
     <arg name="est" default="ekf2"/> <!-- PX4 estimator: lpe, ekf2 -->
     <arg name="vehicle" default="clover"/> <!-- PX4 vehicle configuration: clover, clover_vpe -->
@@ -21,7 +22,7 @@
     </include>
 
     <!-- PX4 instance -->
-    <node name="sitl_$(arg mav_id)" pkg="px4" type="px4" output="screen" required="true" args="$(find px4)/ROMFS/px4fmu_common -s etc/init.d-posix/rcS -i $(arg mav_id)" unless="$(eval type == 'none')">
+    <node name="sitl_$(arg mav_id)" pkg="px4" type="px4" output="screen" required="true" args="$(find px4)/ROMFS/px4fmu_common -s etc/init.d-posix/rcS -i $(arg mav_id)" unless="$(eval type == 'none' or mode == 'hitl')">
         <env name="PX4_SIM_MODEL" value="$(arg vehicle)"/>
         <env name="PX4_ESTIMATOR" value="$(arg est)"/>
     </node>
@@ -34,6 +35,7 @@
         <arg name="led" value="$(arg led)"/>
         <arg name="gps" value="$(arg gps)"/>
         <arg name="use_clover_physics" value="$(arg use_clover_physics)"/>
+        <arg name="hitl" value="$(eval mode == 'hitl')"/>
     </include>
 
     <node name="jmavsim" pkg="px4" required="true" type="jmavsim_run.sh" output="screen" if="$(eval type == 'jmavsim')">
@@ -45,7 +47,7 @@
     <!-- Clover services -->
     <include file="$(find clover)/launch/clover.launch">
         <arg name="simulator" value="true"/>
-        <arg name="fcu_conn" value="sitl"/>
+        <arg name="fcu_conn" value="$(arg mode)"/>
         <arg name="fcu_ip" value="127.0.0.1"/>
         <arg name="gcs_bridge" value=""/>
         <arg name="web_video_server" default="false" if="$(eval type == 'jmavsim')"/>