There are some employees of a petroleum company who move through the sea in fixed headquarters

A: Permanent settling in houses built with the materials customarily used in building is a condition for the Jum`ah Prayer to be obligatory and valid. The case in the question does not meet this condition, so it is not permissible for them to offer the Jum`ah Prayer and they have to offer the Zhuhr (Noon) Prayer instead. And Allah knows best.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.