If you would like to confirm that rescue mode is turned on, on your DC50, you would do this through “Identify Dog Unit”
Step 1: Got to your Dog list on your Garmin Astro 320 and select the dog you want to check. (Press Enter)
Step 2: Select Show Info and Press enter
Step 3: Press the menu button
Step 4: Select Identify Dog Unit and press enter.
You will see a short prompt that shows “communicating with dog unit” and after that you should now see a Screen which shows the state of the Rescue mode, Along with the Unit ID, and Update Rate for that particular Garmin DC50.