Hey Rahuljith,

An Offshore structural engineer will have less opportunities but can earn a higher salary than structural engineer for buildings who always be need  during any construction work.A good structural engineer can be hired to carry out structural design of any structure. The principles are always the same. But experience in a specific type of structure will count because the work is faster and easier And speaking about naval engineering, Naval Enginnering Is One Of The most specialized branch in the mechanical enginnering and it requires a good knowledge of mathematics and physics. Though it is not much about architechture but you will be taught various aspects of ship design, construction .motion and control of the ship. Talking about the scope ,Yes India Has Bit less scope and looking at the present scenario the shipping industry is having the lowest curve as per date, becuase it is predicted that soon in two-three years the shipping industry will be in a progressive  way.

definetley you can join in any of the mentioned courses as per your wish! 

All the best!