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| | Mercator projection - Wikipedia, the free encyclopedia |
 | | All lines of constant bearing (rhumb lines or loxodromes), i. |
 | | The two properties, conformality and straight rhumb lines, makes this projection uniquely suited to marine navigation: courses and bearings are measured using wind-roses or protractors, and the corresponding directions are easily transferred from point to point, on the map, with the help of a parallel ruler or a pair of navigational squares. |
 | | Although the method of construction is not explained by the author, Mercator probably used a graphical method, transferring some rhumb lines previously plotted on a globe to a square graticule, and then adjusting the spacing between parallels so that those lines became straight and make the same angle with the meridians as in the globe. |
| en.wikipedia.org /wiki/Mercator_projection (1231 words) |
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