Quote Originally Posted by Larb View Post
If it has an efficient postal system with riders, might have the changing stations or whatever, where horses are swapped or shod.
These might be included only in government-made maps handed to agents in it's employ - as the stations would likely refuse to serve anyone else.

An interesting question is how to handle ports in such a map. Would there be lines to represent sea lanes like there are for roads? Or would they simply list the most common trade partners for each port, with the typical number of days it takes to sail to each destination? Here one should keep in mind that the duration of voyage from one port to another can vary a lot due to luck with winds. Also the same route can be consistently faster sailed to one direction than it is to the opposite direction (because of prevailing winds and sea currents).