iPhone/Android app marks your location on map

Very short description: This app will help you avoid speeding fines. In some countries, the police stands at the roadside and measuring drivers' speed. If you drive too fast - it will take a picture of you - and you will receive a [login to view URL] speed controls called automatic speed control. I want to make an App that always will be updated with the latest reports on where there is a speed control. What my app must be able to do: # Report speed control - on the map; I need to be able to type an address or select a location on the map - and in this way - marking the point where I know the police are, right now. My App detects address - and send the message out to all other users. (if it's not possible to in the app - as admin. I want to do this on the server/website) # Report speed control - by GPS and current location; A user can drive past a speed control - that is not already notified. Then he presses a "Report a speed control here"-button - after which it will detect where he is - using GPS - and send the information to all other users. From then on, a marker on the map will appear, where you can see 'location, time of report and so on. (this marker will automatic disappear after 4 hrs.) # Share your marker on Facebook; Once you have reported a speed control - so you can also choose to share your report on your Facebook wall. That way, my App get publicity. # Service the police I work as a journalist and my experience tells me that police like to tell about upcoming speed control in several parts of the country - BEFORE they start. It's a warning, and everybody is generally driving more slowly. I'd like to share this information too. All users will receive a regional warning: "Remember that the police keeps a special eye on motorists who speak in mobile phone or forgot the belt, this week." #Options: It should be possible to determine how many warnings you want when you're on the road. Maybe you want all the warnings about speed control within 5 km, 10 km, 25 km, 50 km, 100 km or the entire country. #When you receive a warning - you can choose whether you want a push message - or a push message AND a sound that warns you about speed control. ** I want this app on both iPhone and Android. Please make it clear if you can make iPhone, Android or both **