Nick name for the GPS Navagator you might have in your car or on your cell phone. Given this nick name because of the fact that it is sometimes wrong or not specific enough and then repremands you by saying "you are off specified rout", or something to that effect, when you don't listen to it, thereby making it a "hater".
Sam: I think we're lost
Jane: Don't you have GPS?
SAm: yeah but the damn navahater always get me more lost.