EntityQ1310021· pop 9· linked from 16 articlesisolated danger markSign in to savesea mark indicating a danger spotConnectionsInternational Standard Book NumberEntitynavigationEntitysea markEntityInternational Organization for Marine Aids to NavigationEntitylight characteristicEntitycardinal markEntitylateral markEntitymaritime pilotageEntityspecial markEntitysafe water markEntityemergency wreck buoyEntityCategoriesBuoyage