Some units are sold w/ lifetime map updates, but if that's not the case and you have recently purchased the device, you have something like 30 or 60 days (iirc) to get free map updates from Garmin's website.
Alternatively, you can purchase a lifetime map updates card for ~us$70 on places like Amazon.
Alternatively, you can purchase a lifetime map updates card for ~us$70 on places like Amazon.