@ynotgo – turn-by-turn instructions, like in Google Maps, should be in left/right form … and landmarks add to that (assuming the landmark database isn’t stale). You’re in immediate mode and really only need to know which way to turn next.
Magnitude and direction make more sense when you’re thinking about an entire journey.
PS. I would assume that the locations announced in GM are some form of advertising. I can easily see this spin out of control, where the directions include things like, "… you’ve been driving for a long time, why not stop at McDonalds on your right for a refreshing Coca-Cola drink, only $1.99. I’ll reroute you afterwards.