Another thing that just came to mind.
"Tactical speed": my understanding of this term is, the maximum speed allowed before your arrays start to "wash out(?)", meaning the water flowing on the surface of your sub starts disturbing your sonars, adding noise.
When tracking, it is a good thing to stay at "tactical speed", as you'll get more accurate TMA results, being the lines more distant... meaning the absolute error plays a less relevant role...
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