Agreed on Garmin. The only issue I've had is at field trials where the receiver picks up other collars. Imagine it would be the same if hunting with more than one person with a garmin. Not supposed to pick up other collars unless actively pairing them. I have the just the tracker and another track and train for training. I went with the mini as it is the same weight as the just the tracker.
I’ve never had mine actually start tracking another collar if that’s what you’re saying…occasionally you will get an error message if there is a conflicting collar within range. It will give an option to change the tracking code or keep tracking. This happens when two collars are set to the same ‘dash’ number. For example, 1-19 will conflict with 3-19 and all other *-19 numbers within range. It’s a simple matter of reassigning a new number to your collar.