- Garmin Express is an application developed by the company to register, update, and install all the Garmin devices. It is a desktop application which you can install on your Mac as well as Windows computers. The Garmin Express also gives you the provision to transfer the data from one device to another with just a click. This application does not include any virus or malware, so there is no risk in downloading or installing the device on your system. Every Map, GPS or Navigation device developed by the Garmin can be managed by the Garmin Express. You only require to connect your Garmin device to your system and you will be able to manage your devices. Here we are going to describe the features and process to download and install the Garmin Express application on your system online.