Introduction - If you have any usage issues, please Google them yourself
		 
 SKYPLOT for a given receiver position
    Y=skyplot(X,PRN,C,O) draws the skyplot for the receiver position. The
    required inputdata for the calculation of the skyplot X is N-by-3*M matrix,
    where N are the timesteps and M is the number of the Satellites. The 1st
    colomn is the elevation, the second colomn the azimuth and the 3rd colomn
    is the geometric distance between sv and rx [° ° m].
  
    The output Y is the same matrix als X, the only difference is that the
    satellites below the cutoffangle are marked (number 9999 is written instead
    the Elevation, Azimuth and distance.
    
    The numbers of the satellites are listet in the voctor PRN (M-by-1), C is 
    the cutoffangle for the satellite elevation (default = 5°). The skyplot
    displays only satellites who are visible for more then 10 times.