Save some first disco's for us. CMDR!
Greetings!
There is still lots, lots to discover in the galactic fringes (outer galactic rim, top and bottom of galactic plane). It is true that the intergalactic border has already been established by the pioneers years ago (so it's best to explore the limits with the understanding that one will no longer set records like farthest from Sol or the easternmost system and so on), but there are many areas which are located right behind the border that await your first discovery. Examples:
1. Southwest rim of Formidine Rift and southwest rim of the Errant Marches-these are not that far from Sol. Plenty of area to work with:
2. Achilles Altar rim. It is one of the closest regions to Sol.
3. Lower Mare Somnia rim. It is remote and about 53000 LY from the bubble. The undiscovered area is narrow but long.
4. Hieronymous Delta. Another remote region located in the 50000's LY from Sol but has a very large, wide, largely unexplored "sea." I call it Mare Septentrionalis (the North Sea).
Also, don't forget the top and bottom of the galactic plane. For example, I found about 60 previously undiscovered system in the Synaisa sector (about 30,000 LY from the bubble, in Ryker's Hope). Those 60 systems were the highest I could climb. Any higher requires a fleet carrier. In addition, I found many, many previously undiscovered black holes and neutron stars.
If you look at the ED Astrometrics saturation map, you will note that most of the unexplored regions are not located in the galactic rim....guess where? The center of the galaxy.
You note that I use ED Astrometrics a lot. It is an extremely valuable source, together with EDSM, for planning explorations, particularly to the galactic rim. It saves time (i.e. since I focus on previously undiscovered systems, I can use both sites to see if a system has already been discovered). Also, it makes me aware that some pathways are simply impossible (e.g. looking for a nonexistent shortcut to bridge Tenebrae and Dryman's Point without doing a big detour).
CMDR Janet