The project use the Google MAPS API V3 for show the marker in the near of the user.
In details: system allows the user's location and to show on google maps the nearest points inserted in a xml file or json. In addition, the user from the smartphone or tablet, must be able to draw on the map the area where you want to search. I think this feature is called polygon. Once therefore designed the area, the system without pressing any other button, must be show the points (markers) in that area that matches the data in XML or JSON.