1000s intervalls. The M12+ achieves 2.9E-012 at 1000s intervalls. The M12+ is speced at 10ns 1-Sigma, the Trimble seems to be 15ns at 1-Sigma. There is an M12+ follow-up modell comming soon which is even better than this data. Then there are the curious spikes that leapsecond.com mentions... Seems the Trimble is significantly worse than the Motorola GPS? bye, SJ