upper deck

(i) "upper deck" means the uppermost complete deck exposed to weather and sea, which has permanent means of weather tight closing of all openings in the weather part thereof, and below which all openings in the sides of the yacht are fitted with permanent means of watertight closing. In a yacht having a stepped upper deck, the lowest line of the exposed deck and the continuation of that line parallel to the upper part of the deck is taken as the upper deck; and
PU(A) 379/2003 - LANGKAWI INTERNATIONAL YACHT REGISTRY (REGISTRATION OF YACHTS) REGULATIONS 2003
2. Interpretation.