Iphone application using Maps and GPS function to alert users

? I need to see if it is possible to create a Iphone application where a user can "flag" a location by pressing a button that stores their current location? using GPS coordinates that will then share that area to? other users to be alerted as they are approaching this previously flagged area. I anticipate that? user A will? flag a area and then be allowed to select 1 of several different flags? types to tag the flagged area. ? Then Users B will be able to? set request in the Application? to be alerted to certain? types of flaggd areas as they approach these areas. ? If they? have chosen? to be alerted to? one of these types of flags the app will sound an alarm as they approach the preset distances to these marked areas. ? ? ? ? ? ## Deliverables ? I will need to be able to test this product with the database on the server to make sure all is functioning and will also need to have some time to correct any bugs that re discovered after it is released.