You can certainly consider the course with CASS London. The course offers a wide range of employment opportunities for the post graduates.YOu can consdie options like commercial banking, commodity trading, government, investment banking, law, logistics management, management consultancy, manufacturing, shipping, finance, shipping operations, stockbroking, and university research and teaching.
With regard to you remuneration you can certainly start of with Rs.40,000 to 50,000.
If not this course then you can consider courses like MBA finance which can also be helpful for you to get into finance with merchant navy.
Hope this helps.