I caught this excellent 3rd party online tool from a recent tweet; Coopa.net have developed a very handy tool which will convert your Wattbike session data files to allow upload to GarminConnect, enabling you to store both your indoor and outdoor training sessions in one place.
It's a simple tool and it works, really well. Thanks to Coopa.net for making this available to the Wattbike community.
Head over to www.wattbike2garmin.com to use the tool.