It's done over a Blue Tooth pairing. Once they connect, the "Dial" button appears on the Garmin screen. You need to verify that they are in deed connected. Go into the BT Connection on the Torch and see if the Garmin is listed in BOLD letters. If not, scroll down to select it, hit press the trackpad and select connect.
I have my 9800 paired with my Garmin StreetPilot C550. Works fine.