UPDATE: Garmin has announced an improved collar/transmitter, due for release in the third quarter of 2008.
UPDATE 2: A new model, the Garmin Astro 320, has been released.
UPDATE 3: This model has been discontinued.
The Garmin Astro GPS dog tracking system was designed with hunters in mind. Imagine a GPS unit that shows your dog’s location (actually up to ten dogs) as far as five miles away!