User blog comment:AYET/Mihawk - to the NW and back.../@comment-3119203-20120222022212

1. He simply goes through Mariejois, as some people have noted below.

2. He actually gets his little ship a bubble and goes right on underneath. Screw sea monsters, he has a sword to take care of them.

Concerning the Calm Belt thing, I think Mihawk is perfectly capable of traversing the Calm Belt. The Kuja can do it simply because the Sea Kings are scared to death of those poisonous snakes on the Kuja ship, and Rayleigh can do it because of his sheer brute strength. Mihawk's hawk eyes are scary enough to people (and probably Sea Kings), he can easily handle Sea Kings, and he has the brute strength to propel himself through.