If you observe from different locations the CN16 will put your exact latitude and longitude into your telescope, plus it will enter the exact time. It does improve goto accuracy, since the data entered is more precise than what we normally care to enter. If you observe at the same location all the time, then it is wiser (and cheaper) to find your exact lat. and. lon. and enter it manually and make sure that you enter exact time taking daylight savings into account.
Pros: Enters time, lat. and lon. correctlly. Improves goto accuracy.
Cons: Hard to find CN16 brackets for your scopes...
This review was written in the old system and had content requirements that are different than reviews written today.