How to Use Smart RTH On The DJI Mini 4 Pro Drone

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This guide will provide you with a step-by-step on how to use the Smart Return to Home (RTH) feature on the DJI Mini 4 Pro. 

Smart RTH can be activated in three ways: 

• Manually triggered.
• Automatically by the aircraft's low battery.
• Automatically triggered by the loss of your controller's signal.

Basic Settings

Before take-off you must look at the basic setting and set your preferences. 

1. Ensure the RTH altitude is higher than all obstacles in the flying area.
    
   
   
2. The Signal Lost Action of the aircraft can be set to RTH.
   
   
   
    
3. Descend or hover RTH is recommended. 

After taking off hover the aircraft until your hear the voice prompt 'Home Point updated.'

Manually Trigger RTH

1. During flight you can trigger RTH by pressing and holding the RTH button on the remote controller. 
   
   
   
   
2. Or tapping on the RTH icon from the left side of the camera view and then holding the 'Prompt RTH' icon.
   
   
   
   
   
   
3. To exit RTH press the RTH button on the remote controller once. Or tap the red icon on the left side of the camera view.
   
   

Tips:

• The aircraft cannot detect small obstacles such as power lines and tree lines, if there are such obstacles in the flying area, fly the aircraft to an open area before triggering RTH.
  
  
• DO NOT keep pushing the throttle stick upward. Otherwise, the aircraft will fall after the power is depleted.
  
  
• If the Failsafe RTH is triggered in a low light condition, the aircraft will fly backward for 50m on its original flight route before entering Pre-set RTH, and obstacle sensing will not be available.

Low Battery RTH

1. When the battery level is low and only sufficient to fly to the Home Point a warning will appear in DJI Fly.
   
   
   
   
2. If you tap to confirm RTH or do not take action before the countdown ends the aircraft will automatically initiate low battery RTH.
   
   
   
   
3. If you cancel low battery RTH and continue to fly when the battery is only sufficient to land the aircraft will land and the landing cannot be cancelled.
   
   
   
   
4. During the auto landing you can use the pitch stick and roll stick to move the aircraft horizontally.
   
   Use the throttle to control the descent speed, and find an appropriate place to land as soon as possible.
   
   

Failsafe RTH

If the ‘Signal Lost Action’ of the aircraft is set to RTH when the control signal is lost the aircraft will automatically initiate a Failsafe RTH. Even if the signal is restored during the return flight, the aircraft will continue returning.



AR Display

1. The live AR RTH route will be displayed on the camera view helping you to view the return path and control the flight safety. The camera view also displays the AR Home Point.
   
   
   
2. When the aircraft reaches above the Home Point the gimbal camera will automatically flip downwards.
   
   
   
   
3. The AR aircraft shadow will appear in the camera view when the aircraft is approaching the ground. Enabling you to control the aircraft to land more accurately to your preferred location.
   
   
   
   
4. The AR Home Point AR RTH and AR aircraft shadow are enabled by default.
   
   The AR can be changed in the safety settings.
   
   

Advanced RTH Settings

1. Enter the safety settings and set the Advanced RTH to Optimal or Pre-set.
   
   
   
   
   
   
2. Optimal is the default setting, when selected the aircraft will automatically plan the optimal RTH path and adjust the altitude according to the environmental conditions, regardless of the RTH Altitude setting.
   
   With Optimal RTH the aircraft travels the shortest distance possible reducing the amount of battery power used and increasing the flight time.
   
   
   
   
3. If Pre-set is selected the aircraft will ascend to a pre-set altitude first then plan the RTH path automatically and return to the Home Point.
   
   
   
   
4. In adequate lighting conditions the aircraft will follow the Advanced RTH settings to perform either Optimal or Pre-set RTH.
   
   During RTH the aircraft can bypass the obstacles and GEO zones.
   
   If the environment’s lighting is insufficient such as flying at night or on cloudy and foggy days the aircraft will ascend to the pre-set RTH altitude first and then fly to the Home Point in a straight line.
   
   
   
   
5. The aircraft can bypass the GEO zones during RTH but cannot bypass obstacles.
   
   
   
   
6. If the Failsafe RTH is triggered in a low light condition, the aircraft will fly backward for 50m on its original flight route before entering Pre-set RTH, and obstacle sensing will not be available.
   
   To avoid accidents make sure the RTH altitude you set is higher than all obstacles flying in the area.

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Sources

This answer was generated from information sourced from the following pages:

• heliguy™ Blog - www.heliguy.com/blogs/posts/
• Drone Tutorials - www.heliguy.com/pages/help/