A raised deck at the Stern of some vessels which has evolved from the Sterncastle If a vessel has a quarterdeck; the pilot and other officers will keep watch here, Officer and passenger cabins are usually located below the quarterdeck
A term applied to the afterpart of the upper deck In naval vessels, that portion of the weather deck which is reserved for the use of the officers
"The after part of the upper deck before the poop The quarterdeck was normally reserved for officers, and only they could walk the quarterdeck " (Uden & Cooper)