The sailor from the ship that brought you to the New World is sorry for leading you astray with that scholar he sent you to. But he has another idea who could help you with your map: there is a group of scholars who seem to specialize in languages.
This starts one branch of the second chapter of the RP Missions line. You will have to go to another port and enter the building with the scholars in it. In there, you will find three potential mission NPCs (see below for a list) - you can at this point choose which one to talk to. This NPC will from then on become your main contact for this branch of the mission line.
Ports where the mission takes place:
List of scholar contacts by Nation:
There is a level gap between this mission and the next in the sequence (The Teacher). So if you don't get offered the follow-up immediately (by talking to the scholar again after claiming the reward) it's because you don't meet the level requirements yet. However, once you do, any Harbor Master will start to offer you a mission to go and talk to your scholar contact.