I can now place multiple galaxies in random, non-intersecting patterns. Each galaxy has its own hex grid that references world coordinates--meaning, I can place the galaxies anywhere and their grids take on appropriate values, but I don't have to place any grid locations between the galaxies. Saves quite a bit of space. Later, I'm going to add the ability to create hex grid locations in empty space to allow for the possibility of new destinations being created out there.
Note that the 2-arm spirals below are actually barred spiral galaxies.