Google Maps is now available on the Apple Watch as of version 5.52 of the iPhone app. Meanwhile, more is emerging about the behind-the-scenes mapping efforts of both Google and Apple. Google is using machine learning to predict traffic flows and improve ETA estimates (Engadget, The Verge). More prosaically, 9to5 Mac looks at how Apple collects street data, down to the software, computer hardware and make of car used.