@Nick XR
Yeah, I can relate to that somewhat. The method I use currently is all in-game and working only in my head as every star system I visit I glance over what the star system has and sometimes use the new ping ability to reveal and get some pre-survey stuff in a sector's star system and to cut down the passage of time/days I use the ability to go into hyperspace from where-ever and try to find or get to a jump point or a jump point's cloudy areas in hyperspace and use the ability again to get back into normal space and much closer to the planet or some other object I saw on the other side of the sector map.
Eh, to be honest I'm not sure how to put it into words about how I get by without a marker. Has a lot to do with much older games though where I developed a sense of orientation and picturing a level layout in my head in a form of tunnel-like labyrinth memorization and thus got around without even using a map much, heck I seldom use the map in Doom 1 and 2 and just navigate around the rooms and walls and somehow remembering where I've already been, trail of blood and gore notwithsanding but helpful.