"Above Deck" refers to being on the open, top surface of a boat, rather than in the cabin or below decks. It is the area used for navigation, sailing, and recreation, synonymous with being on the deck itself. This space is often used for meals and enjoying the open air during a trip.

Context: It describes a location, specifically that a person or item is outside the cabin, in plain view, and not inside the hull.

Related Terms:
Aloft: Refers to being even higher, such as in the rigging or on the mast.

Below decks/Below: Inside the cabin or in the lower levels of the boat.

Deck: The "floor" of the boat that covers the hull.