By and large, Google Maps is great, providing well-plotted directions and up-to-date contact information on demand and free of charge. But slight inaccuracies persist, and to fix this problem, Google will now allow people to reposition markers using Street View instead of just maps and satellite images. Perhaps this sounds familiar: you type an address into Google Maps, switch to Street View, and find yourself staring at a Wal-Mart instead of an Italian restaurant.