I have an 08 Avalon with factory navigation.(vin= 4T1BR362B8UT.....)My understanding is that there are 6 or more different navigation systems available. How do I know which one I have to try to get it working properly? Can anyone provide a condensed procedure to setting a destination? Can anyone provide a condensed procedure for getting the voice activation system to work? I haven't had any luck following the novel (manual) to explain how to get the thing to work. I have had it to the dealership multiple times with no simplified results. My wife has a Garmin Nuvi which is easy and a joy to operate. I am very disappointed with the complexity of a system that is anything but user friendly. I would think Toyota should be able to give its customers a condensed answer to these questions.