docs: private GeoPoint getLocation() {
  
          //sample data
          //{"timestamp": 1483742439, "iss_position": {"latitude": "-50.8416", "longitude": "-41.2701"}, "message": "success"}
  
          NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
          boolean isConnected = activeNetwork != null && activeNetwork.isConnectedOrConnecting();
  
          GeoPoint pt = null;
          if (isConnected) {
              try {
                  JSONObject jsonObject = json.makeHttpRequest(url_select);
                  JSONObject iss_position = (JSONObject) jsonObject.get("iss_position");
                  double lat = iss_position.getDouble("latitude");
                  double lon = iss_position.getDouble("longitude");
                  //valid the data
                  if (lat <= 90d && lat >= -90d && lon >= -180d && lon <= 180d) {
                      pt = new GeoPoint(lat, lon);
                  } else
                      Log.e(TAG, "invalid lat,lon received");
              } catch (Throwable e) {
                  Log.e(TAG, "error fetching json", e);
              }
          }
          return pt;
      }