What's the noun for deckside? Here's the word you're looking for.
deck
Any raised flat surface that can be walked on: a balcony; a porch; a raised patio; a flat rooftop.
(nautical) The floorlike covering of the horizontal sections, or compartments, of a ship. Small vessels have only one deck; larger ships have two or three decks.
(aviation) A main aeroplane surface, especially of a biplane or multiplane.