Quadrants with a compass, introduced in the 15th century, were the first portable sundials. The compass served to face the quadrant toward the north and the gnomon (a bit of cord or a flexible triangle) could be raised or lowered to accommodate the latitude where the compass is used. This model has Compass Rose in the upper part with a needle to determine the 32 different rhumbs. The golden age of sundials lasted from the 15th century to the end of the 18th.