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I have an 05 but I'm not sure what/if any the trim level it is. The inside (I'm pretty sure) is whats above base but not sure. It has:
Navi, Heated seats, HUD, electric seats (both) dual climate pretty much everything I can think of. As a new owner I'm learning about this stuff still.
It's funny, being a car guy and knowing somethings about it, is totally different from owning one and figuring stuff out lol
Look in the glove box on the left side. There is a sticker in there with all of the codes for your car. You can search what they mean on here but the easy ones to see are 1LT, 2LT, 3LT, Z51 etc. That sticker will tell you what you have on your car.
As others have already pointed out, it's a 1SB car. In 2005, navigation, XM radio, and OnStar were stand-alone options that were available only with 1SB.