Navigational++tools+GAO

Sailors used the compass to navigate. The arrow allways pointed north. A magnet in the compass always pointed at the noth pole. It was perfected in the late 15th centery. A Jackstaff could measure the Pole Star's distance from the horizon and find were they were at sea __. __ A divider was used to measure distances on charts so sailors could now how much father it was from the ships destination and how far they already travled. A traverse board was used together with a compass and sand glass**.**  Every half-hour the pegs moved to showthe direction the ship was going. The astrolabe w hich was suspended for a ring, and the naviagator moved the alidade, or central rod, until it lined up with the North Star or the sun.