The Jyotisha Vedanga, part of the four ancient Indian Vedas, is the earliest known text that deals with astronomy and navigation. It includes techniques for determining the position of celestial bodies and their use in navigation.

The astrolabe was the main instrument used by Indian navigators for celestial observations. It allowed them to measure the altitude of celestial bodies above the horizon and determine their position.

The monsoon winds played a crucial role in Indian navigation as they allowed ships to travel between different regions by taking advantage of favorable wind patterns.

Aryabhata, a renowned Indian mathematician and astronomer, is credited with developing the concept of the sine function, which is essential for calculating angles and distances in navigation.

The 'Yantra Raj Yantra' was a complex instrument used in Indian navigation primarily for determining the latitude and longitude of a ship's position.

The Chola Kingdom, based in southern India, was particularly renowned for its maritime prowess and naval expeditions, establishing trade routes and conquering territories across Southeast Asia.

Indian navigators primarily relied on observing the stars and celestial bodies to determine the direction of their journey, as the compass was not widely used in ancient India.

The Yukti Kalpataru, written by the Indian scholar Bhoja, contains detailed descriptions of various types of ships, their construction techniques, and their uses in navigation and warfare.

Traditional Indian ships were primarily constructed using wood, particularly teak, due to its durability and resistance to harsh marine conditions.

Surat, located on the west coast of India, was a prominent port city that served as a major hub for maritime trade and cultural exchange, connecting India with various regions across the Indian Ocean.

Shivaji, the founder of the Maratha Empire, is credited with establishing a powerful navy and expanding India's maritime influence, particularly along the western coast.

The 'Garuda Purana' is an ancient Indian text that contains detailed descriptions of celestial navigation methods, including the use of stars and constellations for determining direction and position.

Aryabhata, in his treatise 'Aryabhatiya,' developed a method for calculating the circumference of the Earth, demonstrating his understanding of spherical geometry.

The 'Nakshatra Mala' was a celestial sphere used by Indian navigators to identify and track the positions of celestial bodies, aiding them in determining their location and direction.

Nagapattinam, located on the southeast coast of India, was a prominent port city that served as a gateway for trade and cultural exchange with Southeast Asian countries.