For serious hunters and dog trainers, we recommend this Garmin Alpha 100 with TT-10 collar bundle as it is the best dog tracking & training GPS sytem in the field. You can easily achieve optimum performance from your sporting dogs as the Alpha 100 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, you can get exact positions of up to 20 dogs or hunters 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. Product Highlights: Multi-dog Tracking GPS and Remote Training Device in One: Tracks up to 20 dogs or buddies from up to 9 miles away 18 training levels of continuous and momentary stimulation Tone and vibration alerts Preloaded TOPO U.S. 100k maps Measures dogs’ speed and distance traveled contact xxx xxx xxx8 for more info