how do you get the merchant pass and where is the location of the passenger ship ?
Viewing post in Caliross, The Shapeshifter's Legacy comments
There are two ways to get the merchant pass. The most straightforward is going to the imperial office in Tarkas (same screen as the guilds) and talk to the guys at the front desk (one of the two sells it). You must have reached chapter 2, or they won't sell it, if I remember correctly. Check the walkthrough (CTRL+F "merchant pass"), if you want to read more about the quest that gives the pass as a reward.
As for passenger ships, they can be boarded from Solina's dock and from Rahib's dock (there should be a "captain NPC" you can talk to in both locations).