Indian navigators used the Law of Sines to calculate the latitude of a ship by measuring the angle between the horizon and a known star.

The astrolabe was a versatile instrument that was used by Indian navigators for a variety of purposes, including measuring the angle between the horizon and a star.

Indian navigators used the Rule of Three to calculate the longitude of a ship by comparing the time of day at the ship's location with the time of day at a known location.

The sundial was a simple but effective instrument that was used by Indian navigators to measure the time of day.

Indian navigators used the Pythagorean Theorem to calculate the distance between two points on a map by measuring the length of the two sides of a right triangle and then using the Pythagorean Theorem to calculate the length of the hypotenuse.

The ruler was a simple but effective instrument that was used by Indian navigators to measure the distance between two points on a map.

Indian navigators used the Law of Cosines to calculate the direction of a ship by measuring the angle between the ship's course and a known direction.

The compass was a simple but effective instrument that was used by Indian navigators to measure the angle between a ship's course and a known direction.

Indian navigators used the Rule of Three to calculate the speed of a ship by comparing the distance traveled by the ship with the time taken to travel that distance.

The log line was a simple but effective instrument that was used by Indian navigators to measure the speed of a ship.

Indian navigators used the Law of Cosines to calculate the course of a ship by measuring the angle between the ship's course and a known direction.

The compass was a simple but effective instrument that was used by Indian navigators to measure the angle between a ship's course and a known direction.

Indian navigators used the Rule of Three to calculate the time of arrival at a destination by comparing the distance to the destination with the speed of the ship.

The log line was a simple but effective instrument that was used by Indian navigators to measure the distance to a destination.

Indian navigators used the Law of Cosines to calculate the best route to take to a destination by measuring the angle between the ship's course and the destination.