A new approach for cancelling carrier wave interference signals in Loran-C receivers is presented. The system, which we have called an Adaptive Predictor Interference Canceler, is based on a linear adaptive predictor, which has been implemented using the Normalized LMS algorithm. A big advantage of the proposed method is that no a priori information of the frequency distribution of the interference signals is needed. The result is an adaptive system that automatically implements notches at the frequency of each sinusoid which is present in the input signal. When used in Loran-C receivers, the Adaptive Predictor Interference Canceler provides an efficient and simple method for cancelling Continuous Wave Interference.