A wind-rose or compass of 32 points was drawn, and against each point was written the number of leagues to be sailed in order to raise (or lower) the Pole one degree.
Isalatha mbombo esizikhombisi eziyi32 zazizotywa, phantsi kwesikhombi ngasinye kwakubhalwa iqela leeligi ezimele zihanjwe ukuze kuphakanyiswe okanye kuthotywe ipali ngenqanaba elinye.