in the event of loosing your drone what tracking device would be best to locate it?

Which model?

Your previous thread on this had some good suggestions... were they not what you were looking for?

Hi there, the drone itself has GPS module, in the case that the flies away, if the AC, RC and app still keep the connection, the current location of the drone will show. Or playback the flight record and check the last signal position.
And we don't recommend assembly the unauthorized third-party accessories on the drone. Thank you for understanding.

DJI Thor Posted at 2018-3-4 19:39
Hi there, the drone itself has GPS module, in the case that the flies away, if the AC, RC and app still keep the connection, the current location of the drone will show. Or playback the flight record and check the last signal position.
And we don't recommend assembly the unauthorized third-party accessories on the drone. Thank you for understanding.

well I had all the coordinates however it was found about 100 ft away and it was in a hole where it slid down off the rock cut into a hole,  so I am confident that a locating device would have been helpful,  it was just by chance that a good friend of mine found it.

Some suggestions in your thread Here