Does anybody know if it's possible to search location on the navigation screen via intersection or cross street??? I know there is an option for cross street in the navigation menu but every time I try to use it, it’s unavailable (shaded out). I used several different navigations (not GM vehicles) and that option was always there - I could put just intersection of 2 streets and navigation would start, how come that option is unavailable in my Tahoe??? Is there a problem with only my nav. or is it like that in every GM vehicle navigation?!?!