I have a garmin Astro using it with my german jagd terriers. It's about the best thing ever happened when it comes to dogtracking systems. My dogs hunt almost any game such as hogs,moose,roedeer, fox andbadger. It works like a charm. I've got the Nordic version which comes with the DC30 collar.Mine is absolutely waterproof and the terriers abuse on the collar is hard, but the DC30 has proven itself time after time. I Love it!