title: How to get GPS Coordinates from all the users of my application?
body: <h1>Explanation/Scenario:</h1>
  <p>I am developing a app that needs to get <strong>in real-time(like 3sec's update)</strong> the location of all users of mine app, and these users knowing that, too, will see the another users location, in a map, for example:</p>
  <p><img src="https://i.stack.imgur.com/1KwLQ.png" alt="map example" /></p>
  <p>This location, needs to be in real-time, because all of the users have access to the map, they need to know where are the users of the app, in the exact moment, to find them selves.</p>
  <h1>Question:</h1>
  <p>What i need to do to make my application get in real time the location of all of the users in gps coordinates(<strong>for later use on the map</strong>)?</p>
  <h1>Obs:</h1>
  <p><strong>I am not asking a full application, i only want to know how to get the coordinates each user, by the way, if a answer containing how to put the coordinates on the map, it will be a lot useful! and will get bounty</strong></p>