To perform the Garmin Nuvi updates, plug your gadget into your PC. Attach your Garmin GPS gadget to a computer before starting the update. Run Garmin Express on your computer. For updates, you'll need a steady internet connection. By connecting your device to a Wi-Fi network with Internet access, you may update the charts and applications. This enables you to update your gadget without having to connect it to a computer. Choose Map and update to install map updates.