Check very well cockpit instruments on real scale powerboat offshore...
On most of them you can find a 3 or 4 floating bars instrument on the top of the cockpit...
What's this???
Answer not found in the last year........ sigh...
Maybe it's a balance instrument?

Two screens where you can find out the unknown instrument (on the right top of the cockpit, bars in pvc or glass maybe...)
Schermata 2017-08-15 alle 21.11.11.jpg
Schermata 2017-08-15 alle 21.11.40.jpg

You can see very well in the best 2015 clip about powerboat: