Carbon Monoxide or CO Poisoning
CO POISONING GIVES NO WARNING!! SYMPTOMS MAY NOT PRECEDE UNCONSCIOUSNESS!!!!!
OWNERS OF BOATS HAVING THE FULL CAMPER BACK OR STERN COVERS WITH A CENTER REAR OPENING - NOTE!!
CO poisoning is most likely to occur when a boat is in a forward motion with the forward passenger compartment closed and the stern open. (Removal of rear center panel) also known as The Station Wagon Effect.
CO poisoning may also occur from a leak in an exhaust system or from another boat moored alongside, running a generator.