Most of our builds have at least a few grates to cover openings in the deck. The landlubber in me got to wondering about them in real life.   Are they a permanent fixture?   That seems a little limiting. If they are permanent what happened during inclement weather or rough seas? Battening the hatches? How would you get large items below deck?   If not permanent, were they pulled off sometimes? Did they slide? Sometimes replaced with a cover of some type?   What about other deck openings,