Bluetooth can be used to locate your BikeFinder tracker when its nearby.
When Bluetooth is activated on your phone, you can use the app to see the range to the device.
Under the device:
You will hava a bluetooth icon:
This icon will change to show the range to the device:
Try moving around, and see if the range in meters changes, that way, you can indicate which direction to move in.
The range of this function is about 50 meters in optimal conditions, probably shorter in real life scenarios.