after playing a bit more a few things caught my eye:
marked sectors with notes look no different than other sectors, maybe give them a little icon to show that the player has written something about them?
maybe include some kind of notebook with douby linked entries? (from the map to the logbook by giving a list with all entries which contain the coordinate tag of the relevant sector [X:Y], from the logbook to the map by clicking on the coordinate tag in the logbook.)
'would condense all player notes into a single easy to access location instead of being spread around the whole map.
and would also give players an in-game way to make general notes
there is also no way to find specific types of stations besides manually checking every visited system, maybe some form of selectable filter would be useful?
filters for station types, filters for systems with notes, filters for systems with player assets, filters for systems with stations that buy/sell specific goods etc etc.