https://www.yacrew.com/training/stcw/course/1230-proficiency-in-designated-security-duties/
Proficiency in Designated Security Duties - SecureScot
Information about Proficiency in Designated Security Duties, an STCW course by SecureScot (United Kingdom)
designated security dutiesproficiency
https://www.yacrew.com/training/stcw/course/505-stcw-designated-security-duties-dsd/
STCW Designated Security Duties, DSD - Stream Marine Training Ltd.
Information about STCW Designated Security Duties, DSD, an STCW course by Stream Marine Training Ltd. (United Kingdom)
designated security dutiesmarine trainingstcwdsdstream