| Customer Reviews: Average Rating:  Rating : - 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. + See Full Customer Review |  |