Sometimes you don't now how long a quest is gonna take or how much time you have left to finnish a quest before you gotta go. It's frustrating to lose all progress and the map if you leave. It will be nice if you could save a map to finnish it another time or just save the map for later.
keep progress for quests and maps
Each session is a new beginning. It is a new tale to be sung and therefore is not based on the previous one.
There a multitude of issues with saving it, the most important one is: All pirates share their voyage with their crew.
Who can save it, what happens when that person leaves and the crew continues and who will not be able to complete it.
If you want there multiple threads you can find where people go in way more detail regarding the issues and struggles with this exact suggestion.
The current situation is clean, easily accessible and affordable.
Just enjoy playing a large magnitude of different voyages and the unknown new story you are going to help write in the next session.
Enjoy the mysterious nature of the seas!
I would say it is to do with how the maps are created. Once you place a voyage down, it spawns in the chest and captains from your maps. Once you leave and join a game you are joining a different world not the same instance you were in. The new world would have no record of your maps and icon location, as u leave the world they most likely despawn.
