Which of the following was not a device that made sailing easier and more accurate in the 15th century? Radar Astrolabe Magnetic Compass Maps

The device that was not utilized to make sailing easier and more accurate in the 15th century is a. Radar. During the 15th century, radar technology did not exist. The devices that were employed for navigation during that time included b. Astrolabe, c. Magnetic Compass, and d. Maps. Astrolabe was used for measuring the altitude of celestial bodies, the Magnetic Compass for determining direction, and Maps for navigation purposes.