AutoTMA is flawed per the
RedBook in the download section here:
http://www.subsim.com/radioroom/down...o=file&id=5187
In fact pg. 22, has a specific topic "IX. TMA - THE FLAWS OF AUTOTMA (aTMA).
It does work somewhat competently against strictly AI opponents, which if that's all you will ever play against, you will probably think that you're a great sub commander.
Playing against a live opponent that's reasonably competent in manual TMA and knows that you are relying on AutoTMA (aTMA) will probably result in your losing 9 times out of 10. He will use those known flaws against you and your sub's (aTMA) will NOT get a valid solution.