If the battery is still connected it should still have WiFi. I don't know about whether it is the best technique but go to where you think it is with your phone on and search out its WiFi. Once you are in range of your phone's WiFi you will definitely be in controller range so try to connect. I found mine this way, twice. I searched with my phone then connected the controller so I could see the video feed, which not surprisingly showed vegetation really close up and out of focus. You then should be able to see the Anafi on your map. After the second time I bought a phone that has a compass in it so it would be easier if I ever had to do it again. If it does have the battery connected it will be mewing like a kitten and anybody nearby should hear it so get back out there before somebody else finds it!