You could use an database outside of the app, on a server (MySQL, SQL Server, Oracle etc.). You'll also need a Web Service to send/get the data to/from the database. Your app would pack the data (longitude, latitude, any other info you want) in XML and send it to the Web Service (using JSON or something else) and the Web Service would store the data to the database. And for reading the data your app would get the XML data from the Web Service and parse it.
Thats roughly an idea how you could make it work.
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