Celestron Nexstar CN16 GPS Accessory

Use the power and accuracy of GPS satellites to align your telescope. Plug in this 16-channel GPS module into your telescope's drive base port to link up and automatically download information from one of many global positioning satellites. Controlled with the NexStar computerized hand control (p/n 93962), the CN-16 will greatly improve the accuracy of your star alignments by locating north and leveling the optical tube with more precision than can be done by hand.
Customer Review: Useful, but not as much as expected
This unit has a GPS unit, an electronic compass, and an electronic level built in. Your scope will only use the GPS part, and it will only use it to set your location, and the time. Since the scope remembers the last location you entered, and has an internal clock to keep track of time, after you first set it, this doesn't supply anything absolutley necessary if you always use your telescope in the same place. On the other hand, if you take you scope with you to various places not near your home location, it can be very useful, especially if you change time zones.
Customer Review: Disappointed
I bought the GPS attachment to the telescope and was quite disappointed with it. It failed to work properly so I returned it. It did not establish my location, was slow to operate, etc.

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