The way the ship paths appear and don't appear on the main map is creating real difficulties with planning what to do with where to send a selected ship. Currently, there is no discernible rhyme or reason for why some paths show and others do not.
I would suggest a toggle control accessible directly on the main map that lets us turn these path indicators on or off. This way if I want to know if a colony ship is already assigned to colonize a planet I can toggle ship paths on and the paths within the window of all ships will appear. Then I can toggle it off so I can see a cleaner view.