Garmin.com/express is an application for managing Garmin devices. Used for device registration, fitness data sync with Garmin.com-express Connect, map and software updates, and more. Map and Software Update Instructions: Open the Garmin Center, enter your product name and select Software from the tabs on the left.
NOTE: Garmin Express is not compatible with tablets or phones and must be used with a computer that has a USB port for a data cable or an ANT+ stick for communication. See Can I use Garmin Express on my phone or tablet? for full details.