So we know that is over water most likely, but still it is out of the box and that is impressive.
I bet money that 8 mile number will decrease in the 1st or 2nd update knowing how DJI has operated in the past. Something to keep in mind when they throw those updates online. Better wait to see what they have going on up their sleeve.
Btw, here is where I got info from the other day about the controller for the Mavic:
FCC ID SS3-GL200A1606 C2 by SZ DJI TECHNOLOGY CO., LTD