Developer Features: How to become a developer
Press 
and 
to open the settings preference screen.
Scroll down and tap on MGMapViewer Info.
Now tap seven times on Build number.
That’s it: Now you are a developer:
Go back to the main setting preference screen. Also here the MGMapViewer Info entry reflects this state. Additionally you will see some more settings marked as developer. These setting allow to activate the developer features.
You can switch off this developer mode exactly in the same way: Tap again seven times on the Build number in the info preference screen.