PSC inspections serve as a critical mechanism for identifying and eliminating substandard vessels that pose risks to maritime safety and the marine environment. A vessel is deemed substandard if its hull, machinery, equipment, accommodation, operational safety or environmental protection measures fall significantly below the standards prescribed by relevant conventions, or if its crew fails to meet the requirements outlined in the safe manning document. Clear evidence of non-compliance with convention requirements, or indications that the master or crew lack familiarity with essential shipboard procedures related to safety and pollution prevention, may prompt PSC inspectors to conduct more detailed inspections.