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The detection list of sequential detection algorithms like the Generalized‐Stack‐Algorithm normally includes paths with different search lengths. Therefore, a special metric, the socalled Fano metric, has to be used to allow a comparison between the path metrics. A drawback of the Fano metric is its great computational effort in the case of a time‐variant channel impulse response which occurs typically at data transmission over frequency‐selective mobile radio channels. In this paper the most expensive part of the metric is replaced by a bias depending on the instantaneous signal‐to‐noise ratio and the phase characteristic of the channel. Simulation results obtained for the GSM system show the good performance of this method in view of bit error rate and computational complexity relative to the optimum Viterbi‐Algorithm.