lock pick is pretty much your only option if it is a newer model. Also the lockpick can be disabled by a GM upgrade.
5.0 ver allows you to enter saved or favorite waypoints while moving, or anything if you are less than 5mph. It also lets you scroll through XM categories. I heard lockpick has issues with the newer disks.
Also GM has a bulletin out warning dealers of lockpicks for the NAV or IPOD. They will see if you have lockpick installed if you have various other issues such as drivability, hard starting, etc. At least the IPOD lockpick is just behind the glovebox and can be removed before the dealer.