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Originally Posted by MaHuJa
I believe it may be a matter of the real subs actually using that "dual contact display" which may be because they wanted similarity with the spherical display - to avoid making that much of a distinction between "sonarman sphere" and "sonarman towed".
However, it would appear that IRL there is a separate seat and display for the towed array, which doesn't look quite like the spherical watchstations, so there may indeed be differences.
Either way, what we have now works.
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The second part is true in US boats. There are separate SA and TA operators, and their displays are very different. The SA broadband display shows 4 separate waterfall pictures in three different time averages. The TA display is one single waterfall display that runs from 000rel to 180rel, or forward to aft if you prefer, and generally displays two time averages (this last depends on the exact conar system). That single waterfall is all we need, because we already know that the contact shows up on both sides, and we resolve ambiguity by watching to see if the contact draws up or down the array in a turn. If we had to track dual path on a two-sided TA display it would be a visual nightmare.
If you take the FFG TACTASS broadband display and turn it on its side you have a typical US TABB display.
And you're right, what we have now works. I only brought all of this up to answer the original question.