have a look at the camera, and grid functions.
Hi Michael, Do you know if the camera functions have been activated in arduplane yet?
most people use a take a shot every x seconds approch. depending on your ground speed.
I don't think distance-based camera triggers are implemented in APM yet, and I don't think there are any plans to implement it either. (Hope I am am wrong).
It would be nice, because ground speed can vary, distance stays the same...