Navigation system
 

I just bought an 06 mega cab and it has just a factory cd player in it. I would like to upgrade it to the factory Navigation system. I know I need a new Bezel and the navigation system but what do I need to hook up the system?? like gps receiver/radio ect

I would go aftermarket.

any suggestion's

Pioneer has some really nice units. Alpine does as well. Just look at what each offer and see what fits in to your budget. I always read customer reviews and do a lot of researching on youtube. Just type in the model number of the headunit and more than likely someone has do a review on.