I do not believe I have Teleaid , because I thought it was a subscriber service, but I'll check that out. The shop foreman drove with me and although I've never seen the icon for the GPS signal, when the general map of the route displays it shows I am getting signals from 7 out of the max 8. Where is the antenna located? I was on open road so there was no external blockage like a bridge or parking garage, etc, but the way it sounds is like something is preventing it from zeroing in closer than 300 or 400 feet, alreadys behind my driving. MBUSA says the "locator" needs adjustment. Shouldn't a dealer know that? The dealer says there is nothing they can do. That's how its designed. I'm not buying that or thousands of owners would be up in arms. They just replaced the nav system because the old one had a scratch on the screen. They claim they reinstalled the old one and it does the same thing.. but the old one worked, this one is driving me crazy. Thanks.