title: iOS Find Other Nearby Devices (GPS locations)
body: <p>I have an app that allows a user to transmit their location to a server.  What I am trying to do is have the user press a button that will send a push notification to anyone with the app within lets say a 3 mile radius.  Can someone give me an overview of how I can accomplish this.  </p>
  
  <p>The only way I could think of doing this is publishing the gps coords to a server.  Then when the user presses "Send notif" a message gets sent to the server, then the server does some complex proximity search based upon the location and then returns the values to the user.</p>
  
  <p>My problem is, I have no server-side experience and  have no idea how to program a GPS search algorithm on the server.  </p>
  
  <p>Is there a way for me to do what I want without having to write code on a server? I am able to use <a href="https://www.parse.com/" rel="nofollow">Parse</a> to store the GPS coordinates.  I'd like to keep my server code to simply storing and retrieving values and handle everything else client side. </p>
  
  <p>Thoughts?</p>