The details of features are in the manual.
If Apple had not rejected the application, the steps to use are:
1) Download it from the Apple Store just like you would do for other applications.
Press the 'Apple Store' icon at your iPhone, or you may do it indirectly using on iTune on a Mac.
2) Start the application and it will automatically bring up the previous map that you were using.
3) You may select another map from the iPhone memory.
4) You may download many maps into the iPhone memory.
All Garmin img maps are usuable.
The planned subsequent versions for the application was suppose to include:
- compatibility with open-street-map.
- map drawing, poi marking and then upload to PC.
- auto-routing.
- realtime update of mobile speed trap.
- agricultural/crops mapping.
Now hit a brick wall so I abandon this product and do other things.
My objective of this posting was to inform that we have missed what a good map UI could/should be and also to say that I have nothing nice to say about Apple's business model

, the packaging was nice though.