2002 TrailBlazer GPS navigation

I have a 2002 LT with the Bose audio and the climate control for the driver and passenger. Was a OEM GPS navigation system available for the 2002 Trailblazer with the Bose audio and climate control? Or would you have to give up either/or these options to have the GPS navigation system? If you could have the GPS navigation along with the Bose audio and duel climate control where could I look to get a OEM GPS navigation system for it?
Thanks in advance.