app for iphone and android

looking for android, iphone and website solution The idea is simple: Own areas via the UBGPS application, Put what ever content you like, Whether its an image or just a simple color per pixel. Each pixel will include a Title, Description & URL so people may follow your leads & ideas. the app will be useful for normal gps so that people can use it, the images must load a cretin radius the person is in, not all the images at once because it will be very problematic if there will be a lot of images, also the images should reduce quality so that the image won't be too big to load. everything must work on excellent performance