Two things: 1. Google now gets stats from millions of iPhones. Which can be used to infer important sales information in different regions. 2. Maps improve as

Two things: 1. Google now gets stats from millions of iPhones. Which can be used to infer important sales information in different regions. 2. Maps improve as more people start using them. If more users are on Google Maps, Apple's own product improves at a slower pace.