管かん区く海かい上じょう保ほ安あん本ほん部ぶMeaningsNoun1. Regional Maritime Safety HeadquartersKanji used管pipe区district海sea上above保preserve安peace of mind本book部sectionComposed of管かん区くjurisdictionNoun海かい上じょう(on the) sea; surface of the seaNoun保ほ安あんpeace preservation; security; safetyNoun本ほん部ぶheadquarters; head office; main officeNoun