Sonar autocrew wont tell you what it needs even if you don't supply him with it.
If you are in shallow waters and stream the TA but the TA touches the bottom it's like not deploying it.
If you maneuver a lot your TMA crew won't be able to generate a solid solution also.
Question, did you see Sierra(S##) contacts only or was the autocrew able to build some master (M##) contacts? Because almost always a master contact position is very close to the true position, with aTMA on.
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