A GPS like function similar to the one already existed in game for missions (that showed locations with gold exclamation marks) would be great to have.
This guiding system could allow players to mark open space missions and any locations, and its icon could be shown until mission completion, the cancellation of selection, or removed by docking to any hangar.
Even better would be if we also had a way to mark several sectors for making a route for ourselves via the map.