English: Application of the Rule of Marteloio to find the Tordesillas meridian. A ship setting out from Seville, seeking the Tordesillas meridian due west in the open sea, can use the Rule de Marteloio in reference to the demarcation point (370 leagues west of Cape Verde) to determine when it will reach the Tordesillas meridian (on a "plane" map).
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{{Information |Description ={{en|1=Application of the Rule of Marteloio to find the Tordesillas meridian. A ship setting out from Seville, seeking the Tordesillas meridian due west in the open sea, can use the Rule de Marteloio in reference to the dem