Lots of Garmin users look online for a reliable source to update their Garmin GPS for free, but, they failed. Don’t worry. Here we will let you know the best source and an effective way of how to update Garmin GPS . Most of the Garmin model comes with free lifetime updates and if unfortunately, yours doesn’t come up with such a feature, then you will need to purchase an upgrade. For a free Garmin GPS update, you will need to download the Garmin express application and install it on your computer. Now connect your Garmin GPS to your computer via a USB cable. This software will detect the device and then you will need to click on Check for updates button. Wait until the installation finishes and once done disconnect your GPS.