I need to do an iPhone app and a web site based on GPS.
When you open the app it locate you by GPS and ask to put a pin where you are, like a checkin.
For example: i'm in a park, i open the app, its locate me, i choose a category ex. (cat. A . Cat B, Cat C) , then click PUT A PIN botton and it store on a server. Everything will be anonymous.
From the iphone i can check all the pins of all users.
It make possible to show on google maps all the pins putted from the app.