title: To Calculate Location, is GeoCoordinateWatcher using GPS or A-GPS
body: <p>I am using GeoCoordinateWatcher to get my current location. have these questions.</p>
  
  <p>1) I want to know if GeoCoordinatewatcher can use satelite signal (GPS) to calculate my current location.</p>
  
  <p>2) I understand there is a different between GPS and A-GPS. What is A-GPS.</p>
  
  <p>Thanks</p>