The Gemini Astronomical Positioning System is a professional level computer-to-servo device for controlling a German Equatorial telescopic mount (GEM). It consists of four components: (1) A computer board housed in a flat aluminum panel box to be attached by screws to the pier of your GEM mount; (2) A right ascension servo motor connected mechanically to the mount's RA shaft, and electrically to the Gemini computer via a cable; (3) A declination servo motor (identical to the RA motor) connected mechanically to the mount's Dec shaft, and electrically to the Gemini computer via a cable; and (4) a Hand Controller with buttons, switches, and an 16 character LED display connected to the Gemini computer via a serial cable. A fifth component, though essential, is not provided as part of the Gemini package. It is a 12 to 18 volt D.C. power source that may be either a storage battery or a well-regulated power supply. Now that you've unpacked your Gemini unit, you are no doubt eager to start using it. Please take some time to read through this section of the manual, Gemini Astronomical Positioning System User Manual, before using your Gemini for the first time. It will guide you through installation and first use of your Gemini, and introduce you to some important concepts for using your German equatorial mount.