Updating a Garmin GPS ensures you have the latest maps and software for accurate navigation. Start by connecting your GPS to your computer using a USB cable. Download and install Garmin Express from the Garmin website. Open Garmin Express, and it will automatically detect your device. Click "Add a Device" and follow the on-screen instructions. Once added, select your device and click "Check for Updates." Install available updates, keeping your device connected. Once completed, safely disconnect your GPS.