Sailors commonly use a compass to navigate. This instrument helps determine direction relative to the Earth's magnetic poles. By aligning the compass needle with the magnetic north, sailors can maintain a steady course, especially in open water where landmarks are not visible. Modern navigational techniques often supplement the compass with technology such as GPS, but the compass remains a fundamental tool for understanding one's position and orientation at sea. Its historical significance and reliability, even in adverse conditions, keep it a staple in maritime navigation.