I was wondering if any one had ever replaced the SD card in their GW to update the Navigation Sysytem. I have noticed when I was riding that there were roads that were not on my map. Also does anyone know where to get updates for the Navigation System (do you down load them onto the SD card). As my GW is a New 2009 and was purchased in Nov 2012 the maps are already 3 years old (2013 right around the corner, may as well say they are 4 years old). Any info would be appreciated.