Matsayin juri shine mast ɗin wucin gadi da ake amfani da shi akan jirgin ruwa lokacin da ainihin mast ɗin ya ɓace ko ya lalace. Karami ne, mast ɗin wucin gadi da ake amfani da shi don ɗaukar jiragen ruwa har sai an girka sabon mast ɗin dindindin. Kalmar "juri" a cikin wannan mahallin ta fito ne daga kalmar Faransanci "ajurie," wanda ke nufin "taimako" ko "taimako." Yin amfani da jury mast al'ada ce ta gama gari a cikin tuƙi kuma galibi yakan zama dole a cikin yanayin gaggawa don tabbatar da amincin ma'aikatan jirgin da jirgin ruwa.