The SatNav Toolbox contains ASCII and MAT-files with Keplerian orbital parameters for GPS and Glonass. The positions of all satellites may then be determined by a call to the SatNav Toolbox function SVPOS which takes the Keplerian parameters and the time of week as inputs. Of course for the average user, only those satellites which are visible are of interest at any given time. In order to get a quick perspective of the visible satellites to a given user at a certain time, the SatNav Toolbox function SKYPLOT may be used.