Purchased me a Trackimo GPS tracking device for finding my Mavic whenever testing my own skills....of course, always within line of sight. But dang, that tiny grey Mavic would be hard to find in the chaperrel and bushes.
I attached the Trackimo to the side of my Mavic with Velcro and it works perfectly. I have more confidence now flying further away knowing I'll be able to find the bird quickly, in the unlikely event, it were to become lost. $139, or $189 for a 3G model, at Trackimo.com. Highly recommend.