If you want to know how to update Garmin GPS then this will help you will it.You need to connect your Garmin GPS device to a computer in order to update it. Firstly remove it from your vehicle and make sure the device is switched on. Connect the GPS to your laptop with the help of USB cable and wait while the progress bar scrolls. If you are updating the Garmin GPS for the first time then you will need to manually sign it before starting the update. You will be required to install Garmin Express on your computer which you can download from the official website for either Windows or Mac. You can install it and follow the on screen instructions in order to initiate the update. This is how to update Garmin GPS easily.