This easy to read guide is here
https://store.dji.com/guides/how-to-use-the-djis-return-to-home
which is quite confusing... Lots of rules which is hard to remember in the heat of the moment.
Again it’s worth noting that the Spark is a little bit different with how DJI’s Return to Home operates. When the Spark’s RTH is triggered, if the drone is between 3 meters to 20 meters from its home point then the drone will just land automatically with the RTH at Current Altitude option disabled (the default setting in DJI GO 4). If the option is enabled then the Spark will not ascend if already at height of 2.5m or more, but if below 2.5m then it will ascend to 2.5m during its RTH. Finally, if the Spark is more than 20m meters away then it’ll ascend to the set RTH height before heading back home. One last thing you need to be aware of during the Spark’s RTH is that if it is farther than 100 meters away then the aircraft will return home at a speed of 10m/s and it can’t avoid obstacles. If RTH is used less than 100 meters away then Obstacle Avoidance will be enabled and the Spark will avoid obstacles if the lighting conditions are adequate.
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