If you have a B.Tech in Electronics and Computer Science and are interested in water, ships, and naval work, you can pursue an M.Tech in areas like Naval Architecture and Ocean Engineering, Marine Engineering and Management, or even Dredging and Harbour Engineering, where your ECS skills in control systems and automation are valuable.

To get admission to these M.Tech programs, you'll need to crack entrance exams like GATE , which is a national exam for engineering post-graduate admissions, or the IMU CET, which is specifically for maritime courses offered by the Indian Maritime University and its affiliated colleges.

Hope it helps.