PGN - Pure GPS Navigator

Popular navigation system depends on MAP/Internet.
This app provide DIRECTION by pure GPS information.
What is the usage scenario ?
1.Theme Park
In Disney Land , Universal Studio ...
Sometimes you only want to know which direction to go,
you don't need any app to tell you the route.
2.University campus
Physics Hall, library, toilet room ...
Such tiny places which didn't appear on the map,
you can mark them using this app.
3.Large park
Seesaw, toilet room, bicycle renting, cafeteria...
Such tiny places which didn't appear on the map,
you can mark them using this app.
And the best of all,
you can easily share all these location information with others.