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Hello Mike Blair and welcome. Sincerely sorry to hear about your first flight loss. Hopefully, you will be able to afford to get back up and give it another try. If you follow RoPad's instructions there is a good chance the experts here will be able to tell you where to look for your Phantom. Best of luck.
Many of us in this field have lost a drone to the fly away, once you understand what happened , you will be 10 times the better pilot .
You can learn a lot from doing some research on fly aways. Hope you stay the course