Protect button
 

I've noticed while sailing many times that I need this button for my crew but mostly my ship.Before I had it my crew couldn't wait for me to get.Well I got it now......I found out it doesn't work for anything.Am I doing something wrong or is it that this button is just a waste of a skill?

I would really like to know because I sometimes need my ship to be protected.

(Yes I know it last only 5 seconds but still doesn't do anything)

It protects a bit, but dont stop all damage. I think i used 2 or 3 on Angel.