Celestron 93969 SkySync / GPS Accessory

Описание: The SkySync GPS Accessory unit should work with any computerized Celestron telescope. Plugs into hand control or auxiliary port. It will automatic location information to your telescope.

But beware, the GPS receiver is kind of weak. I would not recommend trying to test it inside the house to see if it works. I had no problem using it outdoors. I paid $169 for it.