To change the color of the dogs track on the Garmin Astro 430 please follow these steps
  1. Go to main menu
  2. Select Dog List
  3. Select which Dog/Collar you would like to change the color of its track on your screen
  4. Select Show Info
  5. This will bring to you to the collar info screen, at this point you will see a colored box at the top left hand corner of the screen. Select the colored box.
  6. You may now scroll through and select an alternative track color for the dog/collar.
Note: Some different colors may seem close in color on your screen so try and select very different colors when at all possible.