There's good reasons for this even though the system doesn't make it clear. Occasionally, you will run into a Failed to set the arrived area! error message when using the Navigation System.
RAGNAROK ONLINE MAP AREAS UPDATE
NOTE: Only NPCs implemented after the Navigation System update have links in their dialogues. Clicking on the link will instantly activate the Navigation System display arrows to send you on your way to the intended target. With the implementation of the Navigation System, links have been added to NPC dialogues to further make use of the tool.
RAGNAROK ONLINE MAP AREAS FREE
The Navigation System can take you through portals or advise you to utilize the nearest NPC warp so feel free to enter the coordinates of your actual destination. The current button to access the Navigation System.