Two short blasts = Passing on ship's starboard side. Three short blasts = Operating in reverse. Five short blasts = Danger signal. In addition, ships will also sound their horns for other reasons; most notably in low visibility. This will usually involved regular bursts of sound to let other ships in the area know that the cruise ship is there. XADO 1 Stage Tuning Atomic Metal Conditioner Restoration FAST S&H. Logistics Oceans Pack Ship Transport Ware Warehouse Transport infrastructure consists of the fixed install anions and including roads, railways, airways, waterways, canals and pipelines and terminals such as airports, railway stations, bus stations, trucking terminals, warehouses, refueling depots including fueling.