This would enable players to create a simple linear route map inside of Ur.
You would need to learn the Cartography skill to unlock this option for Notes, similar to Teleportation allowing you to craft Teleport Scripts.
Once the skill is unlocked, you'd be able to generate a new item called a "Route Map." When you first create it using the "chart" command you can name it (much like a Note). It then adds to a list in the note body whatever street you are currently on.
When you "expand" the Route Map, it simply adds the street you are currently on below the last street added.
This gives you something to plot a specific route along without needing to pull up the GPS, which could also be useful in places not on the map, such as the Home Streets mote.