Garmin ASTRO BUNDLE DC 30 Collar Plus Astro 220. Tired of searching for your hunting dog in tall grass or dense cover? Now you can leave the hunting entirely to him. Introducing Astro, 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 you are ready to turn him loose / no other setup required. As often as every five seconds, your dogs DC 30 transmits his position to your handheld, and you can see his current location and a trail of where he is been on the Map page of your handheld. Switch over to the Dog Tracker page to view a compass pointing to your dogs location as well as his current status: whether he is running, sitting, on point or treeing quarry. Astro can also sound an alarm to let you know instantly when your dog goes on point. Astro boasts a high sensitivity GPS receiver that can track your dogs position even in the densest cover. You can track up to ten dogs at one time with Astro, at a distance of up to seven miles away /depending on terrain/. The system transmits information by line of sight, so it reaches farthest in flat, open territory.