According to Dan Bartel, Garmin's VP of worldwide sales, "the new DC 30 collar is designed to stand up to the torturous abuse of hunting dogs.  Whether it's hounds crashing through thick and swampy woods, or bird dogs bounding through dense CRP fields, the DC 30 is made to take the beating that working dogs dish out daily."

Astro can track up to ten dogs per receiver at once, and the collar gives location updates every five, 10, or 30 seconds (user selectable).  Battery life is 17-36 hours (based on update rate) on the rechargeable DC 30 collar and 24 hours on the Astro 220 receiver, which is powered by two AA batteries.  Both the DC 30 collar and the Astro 220 receiver are completely waterproof.

Here's the specs:

• High-sensitivity GPS receiver
• Dog position updates every 5, 10 or 30 seconds
• Seven mile range, depending on terrain
• SiRF high performance GPS Receiver
• Rugged, IPX7 waterproof design
• 17 to 36 hour battery life, rechargeable lithium ion
• Maintains position on top of dog's back
• Made of durable material
• Convenient, comfortable, easy-to-use
• MSRP: $199