They are pretty useless for tracking a Phantom as they only have Bluetooth range, and it does not have a GPS receiver. the 'crowd locator' function only works if someone else who has the same device is in range of the finder. So if your Phantom goes down in the wild, it would never find it.
As Geebax said, but should you get close enough with your phone or someone else does and it comes up on the map it might work, but you also run the risk of that person retrieving it and you still never see it again
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