A Passenger Ship Safety Certificate (PSSC) is a SOLAS requirement and is basically a three-in-one safety certificate (construction, equipment and radio, covering the requirements of SOLAS chapters II, III and IV), whereas a Passenger Certificate (PC) is a UK Government requirement for a non-SOLAS passenger ship, stating the maximum number of persons the ship can carry within specified plying limits. A PSSC is required by every passenger ship on an international voyage, whereas a passenger ship operating only on domestic voyages requires a PC.