UncategorizedROR CARDS admin6 months ago6 months ago01 mins practice ROR Cards online. ROR-Card Post navigation Previous: What is Special area as per marpolNext: Why do we need to exchange ballast water onboard? List the various methods for carrying out a ballast water exchange. Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.