diff --git a/builder/image-ros.sh b/builder/image-ros.sh
index 8acd9e17..30c7df7f 100755
--- a/builder/image-ros.sh
+++ b/builder/image-ros.sh
@@ -131,7 +131,6 @@ touch node_modules/CATKIN_IGNORE docs/CATKIN_IGNORE _book/CATKIN_IGNORE clover/w
 
 echo_stamp "Installing additional ROS packages"
 my_travis_retry apt-get install -y --no-install-recommends \
-    ros-${ROS_DISTRO}-dynamic-reconfigure \
     ros-${ROS_DISTRO}-rosbridge-suite \
     ros-${ROS_DISTRO}-rosserial \
     ros-${ROS_DISTRO}-usb-cam \
@@ -140,7 +139,6 @@ my_travis_retry apt-get install -y --no-install-recommends \
     ros-${ROS_DISTRO}-rosshow \
     ros-${ROS_DISTRO}-cmake-modules \
     ros-${ROS_DISTRO}-image-view \
-    ros-${ROS_DISTRO}-image-geometry \
     ros-${ROS_DISTRO}-nodelet-topic-tools \
     ros-${ROS_DISTRO}-stereo-msgs
 
diff --git a/clover/package.xml b/clover/package.xml
index 397ea808..dca524c8 100644
--- a/clover/package.xml
+++ b/clover/package.xml
@@ -43,6 +43,7 @@
   <depend condition="$ROS_PYTHON_VERSION == 3">python3-lxml</depend>
   <depend>dynamic_reconfigure</depend>
   <depend>image_proc</depend>
+  <depend>image_geometry</depend>
   <exec_depend>python-pymavlink</exec_depend>
   <test_depend>ros_pytest</test_depend>
 
diff --git a/docs/en/firmware.md b/docs/en/firmware.md
index a8c2d62f..41d2698a 100644
--- a/docs/en/firmware.md
+++ b/docs/en/firmware.md
@@ -17,6 +17,8 @@ It is advisable to use a specialized build of PX4 with the necessary fixes and b
 </ul>
 </div>
 
+> **Warning** If you are using the firmware version older than *v1.10* (for example, `v1.8.2-clover.13`), then in order to avoid configuration errors, use [QGroundControl version *v4.2.0*](https://github.com/mavlink/qgroundcontrol/releases/tag/v4.2.0) (or older). See [detailed information](https://docs.px4.io/v1.11/en/config/battery.html#parameter-migration-notes) about changes in the firmware parameters that cause errors in newer versions of QGroundControl.
+
 <script type="text/javascript">
     // get latest release from GitHub
     fetch('https://api.github.com/repos/CopterExpress/Firmware/releases').then(function(res) {
diff --git a/docs/en/snippets.md b/docs/en/snippets.md
index 052270b5..7fc30619 100644
--- a/docs/en/snippets.md
+++ b/docs/en/snippets.md
@@ -488,3 +488,23 @@ Check, if the code is running inside a [Gazebo simulation](simulation.md):
 ```python
 is_simulation = rospy.get_param('/use_sim_time', False)
 ```
+
+### # {#simulator-interaction}
+
+You can move a physical object (link) in Gazebo (as well as change its velocity) using the `gazebo/set_link_state` service (of the type [`SetLinkState`](http://docs.ros.org/en/api/gazebo_msgs/html/srv/SetLinkState.html)). For example, if you add a cube to the world (link `unit_box::link`), you can move it to the point (1, 2, 3):
+
+```python
+import rospy
+from geometry_msgs.msg import Point, Pose, Quaternion
+from gazebo_msgs.srv import SetLinkState
+from gazebo_msgs.msg import LinkState
+
+rospy.init_node('flight')
+
+set_link_state = rospy.ServiceProxy('gazebo/set_link_state', SetLinkState)
+
+# Change link's position
+set_link_state(LinkState(link_name='unit_box::link', pose=Pose(position=Point(1, 2, 3), orientation=Quaternion(0, 0, 0, 1))))
+```
+
+> **Info** Simple object animation in Gazebo can be implemented [using actors](http://classic.gazebosim.org/tutorials?tut=actor&cat=build_robot).
diff --git a/docs/ru/firmware.md b/docs/ru/firmware.md
index 57f43287..5dea3860 100644
--- a/docs/ru/firmware.md
+++ b/docs/ru/firmware.md
@@ -17,6 +17,8 @@ Pixhawk, Pixracer и [COEX Pix](coex_pix.md) можно прошить, испо
 </ul>
 </div>
 
+> **Warning** Если вы используете прошивку с версией ниже, чем *v1.10* (например `v1.8.2-clover.13`), то во избежание ошибок конфигурирования полётного контроллера, используйте [QGroundControl версии *v4.2.0*](https://github.com/mavlink/qgroundcontrol/releases/tag/v4.2.0) (или ниже). См. [подробную информацию](https://docs.px4.io/v1.11/en/config/battery.html#parameter-migration-notes) об изменениях в параметрах, которые вызывают ошибки в более новых версиях QGroundControl.
+
 <script type="text/javascript">
     // get latest release from GitHub
     fetch('https://api.github.com/repos/CopterExpress/Firmware/releases').then(function(res) {
diff --git a/docs/ru/snippets.md b/docs/ru/snippets.md
index 89d15d60..143a40c1 100644
--- a/docs/ru/snippets.md
+++ b/docs/ru/snippets.md
@@ -499,3 +499,23 @@ param_set(param_id='MPC_Z_P', value=ParamValue(real=1.5))
 ```python
 is_simulation = rospy.get_param('/use_sim_time', False)
 ```
+
+### # {#simulator-interaction}
+
+Переместить физический объект (линк) в Gazebo (а также поменять его скорости) можно при помощи сервиса `gazebo/set_link_state` (тип [`SetLinkState`](http://docs.ros.org/en/api/gazebo_msgs/html/srv/SetLinkState.html)). Например, если добавить в мир объект куб (линк `unit_box::link`), то так можно переместить его в точку (1, 2, 3):
+
+```python
+import rospy
+from geometry_msgs.msg import Point, Pose, Quaternion
+from gazebo_msgs.srv import SetLinkState
+from gazebo_msgs.msg import LinkState
+
+rospy.init_node('flight')
+
+set_link_state = rospy.ServiceProxy('gazebo/set_link_state', SetLinkState)
+
+# Переместить линк в Gazebo
+set_link_state(LinkState(link_name='unit_box::link', pose=Pose(position=Point(1, 2, 3), orientation=Quaternion(0, 0, 0, 1))))
+```
+
+> **Info** Простую анимацию объектов в Gazebo можно реализовать [с помощью акторов](http://classic.gazebosim.org/tutorials?tut=actor&cat=build_robot).