Garmin and MapQuest are up to something. The MapQuest blog says that, “coming in April, we’ll be adding a simple drop-down link to our search results pages that allow you to download destinations or itineraries to your Garmin GPS device, and take them with you on the road.” Syncing desktop and mobile data has been the norm for PDAs and smartphones for years; this makes complete sense. GPS Review reports that syncing will be via USB — and also that something similar will be coming to Google Maps.