A GPS receiver having channel clusters each having a memory-enhanced channel and several standard tracking channels. The memory-enhanced channel includes a signal memory for accumulating carrier frequency leveled signal samples over several epochs into supersamples for an epoch. During an acquisition mode the memory-enhanced channel borrows code correlators from the tracking channels and the carrier clock to the tracking channels is disabled. The supersamples are accumulated in the signal memory in realtime and then played back by the code correlators at a faster rate while the signal memory is accumulating a new set of supersamples. During a tracking mode, the signal memory is bypassed, the borrowed code correlators are returned and the carrier clock is enabled to the tracking channels.