The formula in your OP is correct (IMAO!), or at least agrees with my own analysis. It produces results which agree closely - but not exactly! - with the results shown on Plates XVII and XVIII in SLM-1. There are small differences, usually less than 1 degree, which I think are due to corrections for parallax and what SLM-1 calls "torpedo advance" - the distance the torpedo travels before it settles on its gyro-dictated course. It is interesting that the equation in your OP does not appear anywhere in SLM-1, and that the method used to calculate the curves of Plates XVII and XVIII is not specified either.
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