The Xexun TK102 GPS Tracker and most of its clones is using something, what English Wikipedia calls UC-E6 proprietary (non-USB) plug. So, this is neither microUSB nor miniUSB as I was assuming in the first place.
Here you'll find some links to information about this plug and some simple schematic diagram for tracker.
Here is mentioned schematic diagram:
If you'd like to purchase a cable for Xexun TK102 GPS Tracker, then eBay should be your friend. If, on contrary you'd like to craft your own cable, then this great article will help you or can be at least a good starting point.