A friend has asked me to ask on the forum..she bought a new Garmin which works great in the USA but not here in Mexico does she need to buy a chi or can she get it off the internet thanks les
Many, not all, Garmins will take an SD card or micro SD. you can check your unit and buy and download from the Garmin site.
Note: A map downloaded from Garmin directly to your unit's memory are upgradeable but not transferable to another unit. It's the other way with a map downloaded to an SD card.