The latest version of the Google Maps iOS app has been given some Google Now functionality: when you click on an airport, hotel or restaurant, the app will display any reservation information it can find in your linked gmail account. This functionality was previously only available in the desktop app.
Although Google has added a succession of features to the app, data last month showed that most iPhone users were using the pre-installed Apple Maps. Adding Google Now functionality is an attractive feature for gmail users, but Google faces the same problem as ever since Apple replaced Google Maps with its own offering: most iPhone users will use what Apple gives them.
Google Maps is a free download from iTunes.