In order to achieve multiple access at a single frequency, the C/A-codes are not maximal length sequences. The cross-correlation between two C/A-codes is small as are the autocorrelation sidelobes shown here. This plot was created first by generating the GPS C/A-code for PRN 10 by using the SatNav Toolbox function CACODE. The function GPSCOR was then used to compute the autocorrelation values for lags 0 through 25.