Compass universally used as compass until the invention of the box-like compass with a 'dry' pivoting needle sometime around 1300. Originally, many compasses were marked only as to the direction of magnetic north, or to the four cardinal points (north, south, east, west). Later, these were divided, in China into 24, and in Europe into 32 equally spaced points around the compass card. For a table of the thirty-two points, see compass points. In the modern era, the 360-degree system took hold. This system is still in use today for civilian navigators. The degree system spaces 360 equidistant points located clockwise
Swirl How spot height for Swirl How, although it is included on the 1:50,000 and the height is stated as 802m. Birkett and Wainwright also quote 2,630 ft (802 m) whilst Richards and the British Mountaineering Council 1:40,000 map quote 2,637 ft. (804 m) Swirl How sends out ridges to the four points of the compass, each leading to further fells. Consequently, it also feeds the headwaters of four valleys. The ridge northward to Great Carrs is named Top of Broad Slack, Broad Slack being a ferociously steep grass slope climbing out of the Greenburn valley between neighbouring crags. The ridge is