This is the mapping system I will be going forward with for my consolidated Traveller / Cepheus Homebrew Campaign System.
The Map of Maps has a 6x6 map composed of smaller 6x6 maps. In my Traveller campaign the small hexes in this are sub sectors, for which I use the 3D map. That means the complete Map of Maps represents a Grand Sector, 216 parsecs across and containing around 25,000 star systems. At jump 6 this would take nearly a year to traverse from side to side.
11/06/2018 I have added the 10x10 map, and a 3D 10x10x10 as well. The coordinates can be picked randomly using d10 dice.