Question

Give reason. 

Shivaji Maharaj raised a navy.

Answer 1

1. Enemies on the west coast of India, like the Portuguese of Goa, the Siddi of Janjira, and the British factors of Surat and Rajapur, created obstacles in the work of expanding the Swaraj.
2. It was necessary to control their activities and to protect the west coast. 
3. Maharaj had great foresight and realised that the one who has a navy, controls the sea.

Hence, Shivaji Maharaj raised a navy.