Aravind, some colleges in which you can pursue a course in Marine or Nautical science in Tamil Nadu are:

• Coimbatore Marine College, Coimbatore
• Hindustan Institute of Maritime Training, Chennai
• Indian Maritime University, Chennai
• International Maritime Academy, Chennai
• VELTECH University, Chennai
• RL Institute of Nautical Sciences, Madurai
• Academy of Maritime Education and Training, Chennai
• Southern Academy of Maritime Studies, Chennai
• Park Maritime Academy, Coimbatore

For more details on the fee structure, admission process, eligibility criteria, etc you can visit the given link to get college wise information: https://engineering.careers360.com/colleges/list-of-be-btech-in-marine-engineering-colleges-in-tamil-nadu