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.
Mirda tan ajjotnen ijjan daɣ iwityan mušăm tămmiduwa tan Mercator id Pedro Nunes d turhăjjat ta ijjraw s tabel tan loxodromic id eɣna Nunes idahălan ti daɣ tamăšɣulen net