coon hunting dog gps

What is a good gps for a dog that comes with a collar and does anybody have one they would like to sell.

might check over here:

http://www.coondawgs.com/forum/

Been happy with my sportdog tek 1.0

Always shows where the dog is, if he's moving or stopped, direction moving, speed moving and how far away. As a bonus, you can mark your truck as start point and always know how far away it is and what direction.

Handheld unit and 1 collar runs about 500 new iirc

I have been really looking at that sporttek and the garmin Astro 220 or 320