Cool video. Good to see someone else getting out for a downwinder when the snow flies! You guys look dressed right for it. I was keen to go last weekend but couldn't find a partner - too bad it was 25 knots with snow flurries.
BTW, if you set up the Garmin Edit software to 2 camera editing mode, you can use the speed display overlay on one camera to also display when switching footage to the second camera. The software automatically syncs the footage from the 2 cameras (assuming they're both Garmin Virbs - may also work if the second camera is not a Virb, but I'm not sure). That way, you can display the speed for the whole video even though only 1 camera is GPS enabled.