The astrolabe was a versatile instrument that allowed navigators to measure the altitude of celestial bodies above the horizon, which could then be used to determine latitude.

Brahmagupta was a renowned mathematician and astronomer who lived in the 6th century CE. He developed the concept of the rhumb line, which is a line of constant bearing on a sphere.

The chronometer was a precision timekeeping device that allowed navigators to determine their longitude by measuring the difference between local time and the time at a known reference point.

There is no evidence to suggest that any Indian navigator led the first circumnavigation of the globe.

The dhow was a type of sailing vessel that was widely used by Indian navigators for long-distance voyages. It was particularly well-suited for navigating the Indian Ocean.

Aryabhata was a renowned mathematician and astronomer who lived in the 5th century CE. He developed the concept of the zero meridian, which is the line of longitude that passes through Greenwich, England.

The compass was the primary method used by Indian navigators for determining the direction of true north. It was introduced to India by Arab traders in the 13th century CE.

There is no evidence to suggest that any Indian navigator developed the concept of the nautical chart.

The log line was the primary method used by Indian navigators for determining the distance traveled. It consisted of a rope with a weighted object attached to one end and a series of knots tied at regular intervals along the rope.

There is no evidence to suggest that any Indian navigator led the first voyage to the Americas.

The log line was also used by Indian navigators to determine the speed of the vessel. By measuring the amount of rope that was paid out over a certain period of time, navigators could estimate the speed of the vessel.

There is no evidence to suggest that any Indian navigator developed the concept of the compass rose.

The lead line was the primary method used by Indian navigators for determining the depth of the water. It consisted of a rope with a weighted object attached to one end and a series of marks at regular intervals along the rope.

There is no evidence to suggest that any Indian navigator led the first voyage to Africa.

Indian navigators used a variety of methods to communicate with each other, including flags, drums, and whistles.