Do you have a question about the Celestron CN-16 and is the answer not in the manual?
Remove short screws from the rear cell of the optical tube.
Place mounting bracket over rear cell holes and tighten.
Slide GPS unit onto mounting bracket tabs until it clicks.
Plug GPS cord into the telescope's Auxiliary port.
Attach the included Velcro mounting strap to one of the tripod legs.
Slide GPS unit onto mounting bracket tabs until it clicks.
Plug GPS cord into the telescope's electronics panel.