If your Chinook Book app's location services are off you will see the following message:
This means that the app's location services are off. Here is how to turn them back on.
1. Tap the "Open Settings" button on this screen.
2. Tap the Chinook Book app on the next screen.
3. Tap "Location"
4. Switch this from "Never" to "Always" or "While using the app"
5. Relaunch Chinook Book and you should not see the original screen.