Just the possibility of boulders that might destroy your very expensive dredge might be enough.

Not sure. But even if they were, do you want to have to survey the path of your dredge before every trawl?

I’d assume it’s pretty standard practice already. Your average Florida Man with a boat has a sonar showing the surface before dropping anchor or throwing fishing line… surely industrial fishing groups would know the area before they start exploiting it. But maybe that’s hoping too much!