The Piracy Risk Surcharge (PRS) is a surcharge on sea freight costs that is applied on routes where there is an increased risk of piracy, particularly in some parts of the world such as the Gulf of Aden and the Indian Ocean. Shipping companies implement additional security measures to ensure the safety of the crew and cargo. The costs of these security measures are passed on to customers as a Piracy Risk Surcharge. The calculation may vary and can be a fixed amount per TEU (Twenty-foot Equivalent Unit).