To help you achieve optimum performance from your sporting dogs, Alpha combines proven Garmin GPS dog tracking technology with Tri-Tronics? electronic dog training. This easy-to-use integrated handheld system allows you to track and train your dogs in the field from a range of up to 9 mi, delivering their exact position as often as every 2.5 seconds. With Alpha 100 and TT? 10, you can pinpoint up to 20 dogs or hunters? exact positions on a large, glove-friendly touchscreen display even when they are out of sight. Since Alpha 100 comes preloaded with 100K U.S. TOPO maps you?ll always know your surroundings.