After 2000 mile trip in the 2001 lx470 I think i need GPS upgrade How to? I never drive hers so I didn't really know... but there are a lot of roads NOW that didn't exist in 2001... we just used the Iphone gps but it was kinda comical when the built in GPS thought we were in the middle of a hay field.. is there a simple way to upgrade her stock gps?