See here:
https://www.tomtom.com/en_us/lifetime-services/#maps
Maps —> Lifetime World Maps
The GO 51, GO 61, GO 510, GO 610, GO 5100, GO 6100, GO 520, GO 620, GO 5200 and GO 6200 have access to Lifetime World Maps. These devices come with a pre-installed regional map and the option to download additional maps from around the world at no extra cost through MyDrive Connect.