Hi,

I was at a monument today and I decided to try the Spark's auto-Circle feature today (for the first time, I'll say)

The video below shows what happened. Things were going just fine until the Spark decided to make a crazy beeline right towards the monument. It was only because I interjected at the last minute that it didn't hit it.

The flight data shows the track and how it went wrong, and also shows the point where I manually stepped in.

The box it asked you to draw around the object was around a triangle of the top pointy bit of the monument.

Does anyone have any idea what went wrong, or perhaps what I did wrong? As you'll see from the flight data, it didn't report any errors and had a solid GPS and signal throughout.

Was it windy?

No, very calm.

Even at height I saw no signs of wind and received no alerts in 20 minutes flying.

I had this happen once before with the Spark.
The second time I used it, it worked fine
I hope you find a resolution.

The Spark AI is tracking an image.  It isn't using GPS to stay still.   So at the end it figures the target is retreating and needs some forward to keep on it.  Tracking optically is a poor way to keep distance.  The Spark needs a lazer rangefinder or a radar dish.  So, in lew of those fancy range determining instruments, pilots are required to keep on the ball and watch their drone closely while flying it.  Casual pilots are soon parted from their drone.  

Good job correcting your aircraft when it went off course.

Yikes - that's why you always want to have your finger placed on the pause button whenever you're flying in Active Track.