I just looked on the Garmin website and the latest software update listed is December 4, 2009, version 3.5. I predict renewed interest in the product because of the integration with the K1600s and given the products small demand to date, wonder if they will suddenly be on backorder if people go ahead and buy one now? I would hope if there is a firmware/software update required to make them compatible, that the current units could be updated using the Garmin web updater? I did see mentioned in one of the accessory documents posted on the web a mention that a new part number would be available to allow for purchasing the Navigator IV without the cradle. I currently use a Zumo 665 and really like the weather service feature but I assume that the BMWs will not support that service?