The celestron skysync gps accessory lets you add gps to your celestron computerized telescope so you can get time date and location downloads from orbiting global positioning satellites this 16 channel gps module plugs into your telescopes hand control or the auxiliary aux port on your drive base and then mounts to a tripod leg to stay safely out of the way with included straps features upgrade your celestron computerized telescope to gps with skysync improve the speed and accur