Garmin Astro series lets you keep track of your sporting dog, even when he's ensconced in dense underbrush or out of your line of sight. One of the few GPS units designed specifically for dog tracking, Garmin has created the Astro line to aid hunters and sportsmen in finding their most faithful companion. The Garmin Astro GPS works using a simple electronic collar; simply place it on your canine friend, activate the GPS, and let him loose. This Garmin GPS allows you to mark the spot where your dog has captured prey or track your dog through dense cover. The Garmin Astro Series also includes several GPS accessories to further expand the uses of the Astro. Take the Garmin Astro Dog GPS on your next hunting trip to make sure Fido never leaves your side, even when he's halfway across the forest.