I can bet you that no navigator will get them to Raftel. Nami will play a really major role. There has to be a reason why no one has stumbled upon Raftel accidently.
Also, she is capable of formulating advanced equations in mere minutes to predict a precise course of action. She even has a supernatural ability to sense changes in the weather, "with her body" according to Vivi, and can even predict the emergence of supposedly unpredictable cyclones in the Grand Line. She is one of the best in the navigation game. Plus her financial and navigation expertise.
'They can just find another navigator' Lol. Tho I agree with Robin > Nami. Tbh, they're pretty much equal for me.
What major role? Her role is completely obsolete.
There are 2 characters that make Nami completely useless in a normal situation: Jinbei and Robin.
Road Poneglyphs are the only way to reach laugh tale. Roger only managed to reach there, because he had the luck to get Oden on his ship. It locked Robin as the single most essential character on the crew to reach Laugh Tale. all the others are "expendable" to some extent. Robin isn't.
As for Jinbei, he basically can "pilot" the ship through massive waves and can call a bunch of sea creatures to carry the Sunny or do it himself. There's 0 need for a "top tier navigator". A regular new world navigator is already good enough.
What does Nami bring that is so unique? If only she was at least a top fighter for the crew, but not even that.
It amazes me how people insist in singing Nami's praises when Oda has butchered her job inside the ship by adding the power creeps and "prophecies".
