I haven't tried any other form of search pattern. In fact, I've never seen a description of search patterns used by individual U-boats when sailing alone. They might be described in the U-boat Commander's Handbook, but I don't have a copy of that book. Commanders were constantly exhorted to use their 'hunting instinct'.
Apologies if the statistics seemed to be a little impenetrable. One of the uses of statistics is to determine whether two actions that appear to differ from one another really do differ, or if the apparent difference arises merely by chance. If the probability that two events differ is better than 0.95, then conventionally one says that the probability that the two events are different is 95% (alternatively, that the probability that the two events are really the same, but appear to differ, is less than 5%). In both cases, the result is 'significant' (at the 95% level). Anything that occurs with a probability better than 99% is 'highly significant'.
Stiebler.
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