Likewise with Szell's 9th.
I am curious what nautical sounds like to you. I can't think of any particular chord or structure that is officially nautical. I used the adjective swashbuckling because if I close my eyes while listening to those two Bruckner scherzi (5 and 6) I can almost see pirates swinging on rigging or hopping from one boat to another.
The first movement of the 6th could also easily be a ship appearing out of the mist a la the Moby Dick sequence of The Pagemaster. At least to me, I like to associate music with my own personal images, colors, feelings. Some recordings even imply narratives to me, in their own way. That is just how I experience music. It doesn't have to officially be anything in order for me to associate it that way.