Garmin express is software which is used to download and install the latest Garmin map updates for your device. You can use the Garmin express app for computer to update your maps, update the software, and register a device and many more. You can update Garmin map with just a click of a button so you will have the accurate information when you are driving. Garmin express software is available for the windows and Mac. So, there is no issue which system user you are. You can update the Garmin map by following some simple steps which are given in the below-given section.