if u have a a 06 or 07 u are eligiable for 2 free updates but only till dec31 of this year so just call 1 877 NAV DISC and give them ur VIN #
Sadly no longer the case for 06's. Only the 07's are still eligible. GM wants (are you ready for this) $200USD plus shipping!!!! I only know this after calling the number and speaking with an agent.

That is highway robbery (literally)

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