Telemetry dog tracking collars are real cheap now that most hunters are using gps collars. Just hook the chain to the magnet when you make a catch it pulls it out and the collar is beeping. You can drive down the road and check the traps several miles away. And tell which trap by different frequencies. Warning in some states this does not count as a trap check and people have been ticketed for not checking traps. I use a trx 1000 blue box. It can track 1000 collars are freqs.