Various hypotheses have been tendered over the years, but in any case Mercator's friendship with Pedro Nunes and his access to the loxodromic tables Nunes created likely aided his efforts.
Makudang-kudang hipotesis sampun kaajuin sasuen kawarsa-warsa, nanging sapunapi taler pasawitran Mercator teken Pedro Nunes lan aksesne ka tabel loxodromic sane kakarya Nunes sakadine ngawantu utsahane.