01 January IMU Diploma in Nautical Science (DNS) Posted by 2imu Categories 2imu, Merchant Navy Courses Comments 0 comment IMU-DNS Course. Diploma in Nautical Science (DNS) The one Year DNS Course is a course leading to B.Sc.(Applied Nautical Science) after 18 months of sea service and also leading to 2nd Mate Foreign going Certificate of competency awarded by the … Read More