How is Nami going to map the whole world?

[Warmmedown]

She hasn't been to the other oceans (or has she, while working for Arlong?) or every Grand Line island. Will it be the case that she'll create a world map from other peoples maps, with her contributing unique parts that only those reaching Raftel can contribute?

 

[sei'taer]

She doesn't have to go to every sea to draw a map of the world. She has to go to the places no one else has gone to.