Question...if you take off using Autopilot then switch to Go your bird will still know your homepoint.
This is exactly what happened to me. To be safe I run my critical battery function at 15%.
FWIW your Phantom never "forgets" the home point...the question is really whether or not you can initiate the RTH function. I have done this many times by just flipping the toggle switch on the left side of the RC.
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