This is a simple map for the Gulf of Morbihan... But not just a map:
This is an offline application; an internet connection is not necessary, nor is a fixed data package.
The database contains over 5000 stored locations; just type a name into the search box and there is a high chance that the application will find it for you.
This version does not require an internet connection or Wifi. You will not be charged any roaming fees.
Remember to calibrate the compass for the iPhone every time you start the app. Stay away from electromagnetic interferences. See instructions for details.