Tired of searching for your hunting dog in tall grass or dense cover? With the Garmin GPS Astro 220 you can leave the hunting entirely to him the first high sensitivity GPS-enabled dog tracking system for hunters and sportsmen. This unique system pinpoints your dogs position and shows you exactly where he is, even when you cant see or hear him.The Astro system includes a bright color-screen handheld GPS device and the rugged, all-weather DC 30 collar.The collar has an integrated GPS transmitter and is specially weighted so the antenna will always point to the sky for optimum signal. To get started, just take Astro outdoors and turn on the handheld and transmitter to acquire GPS satellite signals. Then attach the DC 30 to your dog. Now youre ready to turn him loose a no other setup required. The Astro handheld has all the features of Garmins top-line handheld outdoor devices, including a barometric altimeter, electronic compass, microSDa card slot, celestial information, area calculator and rugged, IPX7 waterproof exterior. With optional detailed city street maps, you can search for over 6 million points of interest and create a route on roads with exact turn-by-turn directions.