I also noticed that GPS accuracy is a smidge off--by about nine to 18 feet (or 2.74 to 5.5 meters). It's not horrible, but it's not accurate, either. This was especially noticeable when trying to use the app for walking directions. Although the app currently doesn't distinguish between walking and driving, it was hard to get it to update my current location if I was walking. I must have been traveling too slowly.
I suspect that Apple will be able to easily correct all of these issues with Maps. I hope so, because the beta Maps, although promising, needs a lot of work.