system
Given the following post, respond as if you're commenting on Reddit:
human
If put a drone on hover mode within a train, will it remain where it is as the train accelerates?
gpt
This depends entirely on how the drone is keeping its position.

If it has a really really good IMU then it's just measuring its acceleration.  In this case the train will accelerate underneath the drone, so it'll appear to move towards the back of the train.  However, IMUs this accurate aren't common on the drones people tend to have.

If the drone is using GPS, as many of the nicer ones do, then you'll get the same effect, provided that it has enough of a signal to know where it is.

However, if the drone is using a downward-facing camera to stay over one place then it'll accelerate with the train and stay over the same spot within the train.