Delphi GPS DVD Maps

I noticed my 2006 Tahoe has the Delphi Touchscreen GPS unit, and the map data DVD is at version 1 (NA40000-11L1).

Does anyone know if there's newer map data dvd versions which will work with my touchscreen GPS?

Thanks

Here are some later versions for you.

GM Nav Disc v2.0 15105609
GM Nav Disc v3.0 10390370
GM Nav Disc V4.1 15792651
GM Nav Disc v5.0 15906573(U)