Alpha 100 010-01041-20 (Handheld Only). Achieve optimum performance from your sporting dogs. Alpha combines proven 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, pinpoint up to 20 dogs or hunters' exact positions on a large, glove-friendly touchscreen display even when they are out of sight. Because Alpha 100 comes preloaded with 100K U.S. TOPO maps, you'll always know your surroundings. By Garmin.